Q1.Consider the following statements regarding the impacts of climate change on agriculture:
1. Moderate warming, defined as an increase of 1 to 3°C in mean temperature, is expected to have negative impacts on crop yields in temperate regions.
2. In India, studies predict a decline in summer rainfall by the 2050s, which is significant as this rainfall accounts for nearly 70 per cent of the annual total.
3. Projections for the 2050s indicate that Central India will experience a decrease in winter rainfall, while semi-arid regions of Western India are expected to receive higher than normal rainfall.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Moderate warming (1 to 3°C) is expected to benefit crop yields in temperate regions. Negative impacts are projected for lower latitudes with even moderate temperature increases. Statement 2 is correct. Summer rainfall is crucial for Indian agriculture, accounting for almost 70 per cent of the total annual rainfall, and studies predict its decline by the 2050s. Statement 3 is correct. Projections indicate that semi-arid regions of Western India will receive higher than normal rainfall, while Central India will experience a decrease of 10 to 20 per cent in winter rainfall by the 2050s. Therefore, only two statements are correct.
TextbookHard
Q2.Consider the following statements:
Statement I: In the context of Indian agriculture, rising temperatures are projected to increase the overall cost of crop production.
Statement II: An increase in temperature is expected to decrease the fertilizer requirement for achieving the same production targets, thereby reducing input costs.
Statement III: Due to climate change, the productivity of kharif season crops is projected to experience a greater decline compared to rabi season crops.
Which one of the following is correct in respect of the above statements?
Explanation: Statement I is correct. Rising temperatures increase fertilizer requirements for the same production targets, which contributes to a higher cost of crop production. Statement II is incorrect. Rising temperature would increase, not decrease, the fertilizer requirement for the same production targets. This leads to higher GHG emissions and cost of crop production. Statement III is incorrect. There would be a decline in the productivity of rabi as compared to kharif season crops. Therefore, only Statement I is correct.
TextbookHard
Q3.With reference to the impacts of climate change on land and water resources, consider the following statements:
1. The amount of arable land in high-latitude regions is likely to increase primarily due to the submergence of coastlines from rising sea levels.
2. The International Commission for Snow and Ice (ICSE) has reported that Himalayan glaciers, which are crucial dry-season water sources for major Asian rivers, could disappear by 2035 if current trends persist.
3. In South Asia, climate change is projected to cause losses for regional staples like rice and maize that could exceed 10 per cent by 2030.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The amount of arable land in high-latitude regions is likely to increase due to the thawing of snow and reduction of frozen lands, not due to rising sea levels. Rising sea levels, in fact, are expected to reduce arable land along coastlines through submergence and inundation. Statement 2 is correct. The ICSE reported that Himalayan glaciers, the principal dry-season water sources for rivers like the Ganges, Indus, and Brahmaputra, are shrinking rapidly and could disappear by 2035 on current trends. Statement 3 is correct. It is projected that in South Asia, losses of many regional staples, such as rice, millet, and maize, could top 10 per cent by 2030. Therefore, only two statements are correct.
TextbookHard
Q4.With reference to the geoengineering technique of 'Copying a Volcano', consider the following statements:
1. The primary mechanism involves injecting sulfur-dioxide gas into the atmosphere to block solar radiation.
2. Sulfur is considered an effective agent because it heats the stratosphere, which complements the overall cooling effect on the planet.
3. Compared to sulfur dioxide, hydrogen sulfide is considered a less suitable candidate for atmospheric seeding.
How many of the above statements are correct?
Explanation: Statement 1 is correct. The technique proposes injecting sulfur dioxide into the atmosphere to create a cloud that blocks some of the sun's radiation, mimicking a volcanic eruption. Statement 2 is incorrect. Sulfur is effective precisely because it does not heat the stratosphere as much as other aerosols, and therefore would not work against the intended cooling effect. Statement 3 is incorrect. Hydrogen sulfide is described as an even better candidate for atmospheric seeding than sulfur dioxide.
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TextbookHard
Q5.Consider the following pairs:
Geoengineering Technique : Proposed Mechanism
1. Seeding the Sea : Using iron to stimulate phytoplankton which pull carbon from the atmosphere.
2. Whitening Clouds : Spraying seawater using wind-powered ships to increase solar radiation reflection.
3. Artificial Trees : Using absorbent resin panels that react with atmospheric CO2 to form a solid.
How many of the above pairs are correctly matched?
Explanation: Pair 1 is correctly matched. The technique involves adding iron to the ocean to promote the growth of phytoplankton, which are adept at pulling carbon out of the atmosphere during photosynthesis. Pair 2 is correctly matched. The plan is to spray seawater into the sky to whiten clouds, thereby increasing their capacity to reflect solar radiation. Pair 3 is correctly matched. Artificial trees are designed with panels made of an absorbent resin that reacts with carbon dioxide in the air to form a solid, capturing the carbon.
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TextbookHard
Q6.Consider the following statements regarding carbon capture and its utilization:
1. The absorbent resin on 'artificial trees' reacts with atmospheric carbon dioxide to form a liquid.
2. Captured carbon dioxide can be commercially utilized in horticulture for use in greenhouses.
3. The process of releasing captured carbon from the filters of an 'artificial tree' involves exposing them to steam, which results in liquid CO2.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. The absorbent resin on the panels of an artificial tree reacts with carbon dioxide to form a solid. Statement 2 is correct. Horticulturists require CO2 in greenhouses for plants to use during photosynthesis, which is a potential commercial use for sequestered carbon. Statement 3 is correct. The captured carbon is released from the filters when they are exposed to steam, and this process allows the carbon to be seized as liquid CO2.
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TextbookHard
Q7.Consider the following statements regarding solar energy generation technologies:
1. In Concentrated Solar Power (CSP) technology, photovoltaic cells absorb photons to free electrons, thereby generating a direct current.
2. Solar-Thermal electricity generation involves heating a liquid, such as synthetic oil or molten salt, to produce steam for a conventional generator.
3. Photovoltaic electricity generation utilizes a mirrored surface to reflect sunlight onto a receiver that heats up a liquid.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. It describes the mechanism of Photovoltaic (PV) electricity, not Concentrated Solar Power (CSP). CSP uses focused sunlight to heat a fluid. Statement 2 is correct. Solar-Thermal electricity, also known as CSP, uses a solar collector with a mirrored surface to heat a liquid, which is then used to make steam and produce electricity. Commonly used fluids include synthetic oil and molten salt. Statement 3 is incorrect. It describes the mechanism of Solar-Thermal or CSP technology. Photovoltaic electricity generation uses PV cells that absorb direct sunlight to generate electricity directly through the photovoltaic effect.
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TextbookHard
Q8.Consider the following statements regarding renewable energy:
1. All renewable energy sources are fairly non-polluting and considered clean, without exception.
2. India's up-scaled target for renewable energy capacity was 175 GW by the year 2022, which included 100 GW from solar.
3. Co-generation is a process of deriving energy from continuously replenished natural resources like wind or tides.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. While most renewable sources are considered clean, biomass, though a renewable source, is a major contributor of indoor pollution. Statement 2 is correct. The Government did upscale the target of renewable energy capacity to 175 GW by the year 2022, which was composed of 100 GW from solar, 60 GW from wind, 10 GW from bio-power, and 5 GW from small hydro-power. Statement 3 is incorrect. Co-generation is defined as producing two forms of energy from one fuel; it is not a method of deriving energy from continuously replenished resources like wind or tides.
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TextbookHard
Q9.With reference to the functioning of Photovoltaic (PV) cells, consider the following statements:
1. When enough photons are absorbed by the negative layer of a PV cell, electrons are freed and migrate to the positive layer, creating a voltage differential.
2. The power generated by a photovoltaic system is initially Alternate Current (AC), which is then converted to Direct Current (DC) using inverters.
3. Parabolic troughs are a type of collector used in photovoltaic electricity systems to focus sunlight onto the PV cells.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. In a PV cell, photons are absorbed by the negative semiconductor layer, which frees electrons. These freed electrons then migrate to the positive layer, which creates the voltage differential necessary for current flow. Statement 2 is incorrect. The power generated by a PV cell is Direct Current (DC). Inverters are used to convert this DC power into Alternate Current (AC) for use in most applications. Statement 3 is incorrect. Parabolic troughs are used in Concentrated Solar Power (CSP) or solar thermal technology, not in photovoltaic systems. They focus sunlight to heat a fluid, not onto PV cells.
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TextbookHard
Q10.Consider the following statements regarding the factors that determine the electricity production of a wind turbine:
1. Doubling the blade radius of a turbine results in a doubling of the power produced.
2. High altitude locations are generally more productive for wind turbines due to less turbulent wind.
3. A wind turbine typically generates energy only when wind speeds are between 4 and 25 metres per second.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Doubling the blade radius results in four times more power, not double. Statement 2 is incorrect. High altitude locations are less productive for turbines. This is because air density, which is a function of altitude, temperature, and pressure, is lower at high altitudes. The dense, heavy air near sea level drives rotors more effectively. Statement 3 is correct. A wind turbine generates energy at a speed of 4-25 metres per second.
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TextbookHard
Q11.Consider the following statements regarding types of wind turbines:
1. The vertical-axis turbine design is considered optimal for large-scale electricity generation due to its high torque.
2. A horizontal-axis turbine has its blades rotating on an axis perpendicular to the ground.
3. Vertical-axis turbines are specifically designed to take advantage of the higher and less turbulent wind speeds found at elevations of 100 feet or more.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The slow rotational speeds of vertical-axis turbines are not optimal for generating electricity, although they are useful for tasks like grinding grain or pumping water. Statement 2 is incorrect. A horizontal-axis machine has its blades rotating on an axis parallel to the ground. It is the vertical-axis turbine that has its blades rotating on an axis perpendicular to the ground. Statement 3 is incorrect. Vertical-axis turbines do not take advantage of the higher wind speeds at higher elevations, in contrast to horizontal-axis turbines which are mounted on tall towers for this purpose.
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TextbookHard
Q12.Consider the following pairs related to wind energy in India:
1. State with maximum wind energy potential at 100m AGL : Tamil Nadu
2. Nodal Ministry for offshore wind energy development : Ministry of New & Renewable Energy
3. Nodal Agency for allocation of offshore wind energy blocks : National Institute of Wind Energy
4. National wind energy target by the year 2030 : 60 GW
How many of the pairs given above are correctly matched?
Explanation: Pair 1 is incorrectly matched. Gujarat has the maximum wind energy potential at 100 m AGL, followed by Karnataka and Maharashtra. Pair 2 is correctly matched. The Ministry of New & Renewable Energy (MNRE) is the Nodal Ministry for the use of offshore areas within the Exclusive Economic Zone (EEZ) under the National Offshore Wind Energy Policy, 2015. Pair 3 is correctly matched. The National Institute of Wind Energy (NIWE) is the Nodal Agency for the development and allocation of offshore wind energy blocks. Pair 4 is incorrectly matched. The wind energy target for 2030 is 200 GW. The target for 2022 was 60 GW.
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TextbookHard
Q13.Consider the following statements regarding different types of hydropower facilities:
1. Pumped storage facilities function as energy storage systems, using surplus electricity from other sources to move water to a higher elevation for later use.
2. Impoundment facilities, the most common type of hydropower, typically involve a large dam to create a reservoir.
3. Diversion, or run-of-river, facilities always require a dam to channel a portion of a river through a penstock.
Explanation: Statement 1 is correct. Pumped storage facilities work like a battery, storing energy by pumping water from a lower reservoir to an upper one when electricity demand is low, and releasing it to generate electricity during high demand. Statement 2 is correct. An impoundment facility is the most common type and uses a dam to store river water in a reservoir. Statement 3 is incorrect. A diversion facility channels a portion of a river but may not require the use of a dam.
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TextbookHard
Q14.With reference to Small Hydro Power (SHP) in India, consider the following statements:
1. A hydropower project is classified as 'Small Hydro' if it has an installed capacity of less than 25 MW.
2. SHPs are predominantly run-of-river installations, which mitigates the adverse environmental effects associated with large-scale hydro projects.
3. India has successfully exploited more than 50% of its identified potential of approximately 21,100 MW for small hydro projects.
Explanation: Statement 1 is correct. Small hydro is defined as any hydropower project with an installed capacity of less than 25 MW. Statement 2 is correct. SHPs are in most cases run-of-river, using small weirs with little or no water storage, thus avoiding the major environmental impacts of large dams. Statement 3 is incorrect. The Ministry of New and Renewable Energy aims to exploit at least 50% of the potential in the next 10 years; it is a future target, not a past accomplishment.
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TextbookHard
Q15.Consider the following pairs related to ocean energy projects in India:
1. Ocean Thermal Energy Conversion : Utilizes temperature differences in the water column
2. First Wave Energy Project : Hanthal Creek, Gulf of Kutch
3. Proposed Tidal Energy Project : Vizhinjam, near Trivandrum
How many of the above pairs are correctly matched?
Explanation: Pair 1 is correctly matched. Ocean Thermal Energy Conversion (OTEC) uses the temperature differences between the surface of the ocean and its depths to operate a heat engine. Pair 2 is incorrectly matched. The first wave energy project was set up at Vizhinjam near Trivandrum. Pair 3 is incorrectly matched. A major tidal wave power project is proposed to be set up in the Hanthal Creek in the Gulf of Kutch, Gujarat.
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TextbookHard
Q16.With reference to biomass as an energy source, consider the following statements:
1. Burning biomass releases a significantly lower amount of carbon dioxide per unit of energy compared to burning conventional fossil fuels.
2. The carbon neutrality of biomass energy is based on the principle that it releases carbon dioxide that was recently captured during its own growth cycle.
3. The process of using biomass for energy is always carbon-neutral, as the carbon released during combustion is perfectly balanced by the carbon absorbed during growth.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Burning biomass releases about the same amount of carbon dioxide as burning fossil fuels. The key difference is not the quantity of CO2 released during combustion, but the origin of that carbon. Statement 2 is correct. Biomass releases carbon dioxide that is largely balanced by the carbon dioxide captured in its own growth, contrasting with fossil fuels which release carbon captured many years ago. Statement 3 is incorrect. The carbon balance of biomass depends on how much energy was used to grow, harvest, and process the fuel. Therefore, it does not always result in a perfectly neutral carbon addition to the atmosphere.
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TextbookHard
Q17.Consider the following statements regarding technologies for converting biomass to energy:
1. Pyrolysis is a process of thermal decomposition where organic material is heated in the presence of excess air to produce syngas.
2. Gasification involves the partial combustion of organic matter in an environment with a restricted quantity of oxygen.
3. Combustion is a process where waste is directly burned in an anaerobic environment at high temperatures to liberate heat energy.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Pyrolysis is a process of chemical decomposition of organic matter brought about by heat in the absence of air, not in the presence of excess air. Statement 2 is correct. Gasification can occur as a result of partial combustion of organic matter in the presence of a restricted quantity of oxygen or air to produce 'producer gas'. Statement 3 is incorrect. Combustion, or incineration, involves burning waste directly in the presence of excess air (oxygen), which is an aerobic environment, not an anaerobic one.
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TextbookHard
Q18.Consider the following statements regarding power generation from biomass:
1. Conventional power plants typically condense the low-pressure exhaust steam, which contributes to their relatively low efficiency of around 35%.
2. Cogeneration plants achieve high efficiency levels by utilizing the low-pressure exhaust steam for heating purposes rather than condensing it.
3. In India, the primary potential for bagasse-based cogeneration lies in sectors with joint heat and electricity requirements, such as sugar mills, distilleries, and the paper industry.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. In a conventional power plant, the exhaust steam is condensed to water, and the large quantum of heat lost in this process limits the efficiency to around 35%. Statement 2 is correct. A cogeneration plant does not condense the low-pressure exhaust steam but instead uses it for heating, allowing for very high efficiency levels in the range of 75%-90%. Statement 3 is correct. The potential for cogeneration is concentrated in facilities that require both heat and electricity. Since India is a major sugar producer, bagasse-based cogeneration is promoted in sugar mills, along with other industries like rice mills, distilleries, petrochemicals, fertilizers, steel, chemical, cement, and pulp and paper.
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TextbookHard
Q19.Consider the following statements regarding the fundamental principles of geothermal energy:
Explanation: Statement I is incorrect. The heat in the earth's inner core is primarily generated from the decay of naturally occurring radioactive materials like uranium and potassium, not from the fusion of lighter elements. Statement II is correct. The geothermal gradient represents the rate of temperature increase with increasing depth into the Earth's crust. The average gradient is approximately 2.5-3 °C per 100 meters.
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TextbookHard
Q20.Consider the following pairs regarding potential geothermal sites in India:
1. Puga Valley : Jammu and Kashmir
2. Tattapani : Chhattisgarh
3. Tuwa : Maharashtra
4. Bakreshwar : West Bengal
How many of the pairs given above are correctly matched?
Explanation: Pair 1 is correctly matched: Puga Valley is located in Jammu & Kashmir. Pair 2 is correctly matched: Tattapani is located in Chhattisgarh. Pair 3 is incorrectly matched: The Tuwa geothermal site is located in Gujarat, not Maharashtra. Pair 4 is correctly matched: Bakreshwar is located in West Bengal. Therefore, only three pairs are correctly matched.
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TextbookHard
Q21.With reference to the challenges associated with geothermal power generation, consider the following statements:
1. India, despite its early start in the 1970s, currently has no operational geothermal power plants.
2. One of the primary execution challenges is the potential escape of harmful radioactive gases from drilled holes.
3. The Cambay graben and the Son-Narmada-Tapi graben are classified as orogenic geothermal provinces.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. There are currently no operational geothermal plants in India. Statement 2 is correct. A significant execution challenge involves the risk of harmful radioactive gases escaping from deep within the earth through the drilled wells. Statement 3 is incorrect. The Cambay graben and the Son-Narmada-Tapi graben are classified as non-orogenic geothermal provinces. Orogenic regions include the Himalayan, Naga-Lushai, and Andaman-Nicobar provinces.
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TextbookHard
Q22.Consider the following statements regarding fuel cells:
1. Fuel cells operate by converting the chemical energy of a fuel into electricity through a process of controlled combustion.
2. The primary emissions from fuel-cell powered vehicles are Suspended Particulate Matter (SPM) and SO2.
3. In power generation, fuel cells typically have a lower efficiency level, around 35%, compared to conventional large-scale power plants.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Fuel cells are electrochemical devices that convert chemical energy directly into electricity and heat, specifically doing away with combustion. Statement 2 is incorrect. The only emissions from fuel cells are CO2 and water vapor. Significant quantities of SPM and SO2 are emitted by diesel-run buses, which fuel cells are proposed to replace. Statement 3 is incorrect. Fuel cells demonstrate higher efficiency levels, reaching up to 55%, whereas conventional power plants operate at an efficiency of about 35%.
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TextbookHard
Q23.With reference to the types of hydrogen based on extraction methods, consider the following statements:
1. Grey Hydrogen is produced exclusively through the steam methane reformation (SMR) of natural gas.
2. The production processes for Grey Hydrogen are generally considered to be carbon-intensive.
3. Blue Hydrogen is produced via the gasification of coal or lignite.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Grey Hydrogen is produced via coal or lignite gasification or through steam methane reformation (SMR) of natural gas; it is not exclusive to SMR. Statement 2 is correct. The methods for producing Grey Hydrogen are described as being mostly carbon-intensive processes. Statement 3 is incorrect. The production of hydrogen from coal or lignite gasification is a method for creating Grey Hydrogen, not Blue Hydrogen.
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TextbookHard
Q24.Consider the following statements:
Statement I: A significant increase in geothermal power generation faces considerable infrastructural challenges related to electricity transmission.
Statement II: Geothermal power plants must be located near specific reservoirs, often in rural areas, and it is not practical to transport steam or hot water over long distances.
Statement III: The primary constraint for the widespread commercialization of fuel cells is their low energy conversion efficiency compared to internal combustion engines.
Which one of the following is correct in respect of the above statements?
Explanation: Statement I is correct. The ability to increase geothermal power plants is limited by the capacity of the existing power grid and the high cost and difficulty of constructing new power lines. Statement II is correct and serves as the correct explanation for Statement I. Because geothermal plants are tied to specific rural locations and their energy medium (steam/hot water) cannot be transported far, they are dependent on the transmission grid's accessibility in those remote areas, creating the infrastructural challenge mentioned in Statement I. Statement III is incorrect. Fuel-cell powered vehicles have very high energy conversion efficiency. The biggest hurdle in the widespread commercialization of fuel cells is their high initial cost.
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TextbookHard
Q25.Consider the following statements regarding India's food and water security projections:
1. To meet future requirements, India's total foodgrain production has to be increased to 400 MT by the year 2050.
2. The agriculture sector's share of water consumption is projected to decrease to approximately 58% by 2050, though it will remain the largest consumer.
3. The Gangotri glacier's rate of retreat has been recorded at approximately 38 meters per decade.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. The projection is to increase food production to 400 MT by the year 2035, not 2050. The projection for 2050 is that the total foodgrain production has to be doubled. Statement 2 is correct. The agriculture sector currently consumes about 70% of available water, and with judicious use, this demand may come down to about 58% by 2050, while still remaining the largest consumer. Statement 3 is incorrect. The available records suggest the Gangotri glacier is retreating about 38 meters per year, not per decade.
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TextbookHard
Q26.Consider the following statements regarding the impacts of climate change on water resources in India:
1. In the long term, glacial melt due to climate change is expected to cause a sustained and permanent increase in summer flows in major Himalayan river systems.
2. Sea level rise is a contributing factor to water stress in coastal areas through the mechanism of groundwater salinisation.
3. Anthropogenic activities like deforestation and urbanization in the Himalayan region are linked to an increase in the frequency of hydrological disasters.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. Glacial melt is expected to increase summer flows in some river systems only for a few decades, which will be followed by a reduction in flow as the glaciers disappear. The increase is therefore temporary, not sustained or permanent. Statement 2 is correct. In coastal areas, sea level rise is expected to exacerbate water resource constraints due to the increased salinisation of groundwater supplies. Statement 3 is correct. Extensive land use, including deforestation and urbanization, in the Himalayan region has led to frequent hydrological disasters.
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TextbookHard
Q27.Consider the following pairs:
1. Change of course of River Kosi : A direct consequence of Himalayan glacial retreat
2. Increased summer flows in perennial rivers : Eventual disappearance of glaciers
3. Enhanced sedimentation in Himalayan lakes : Extensive land use and deforestation
How many of the above pairs are correctly matched?
Explanation: Pair 1 is incorrectly matched. The change of course of the River Kosi is cited as an example of devastation from floods linked to climate change, not specifically as a direct consequence of glacial retreat. Pair 2 is incorrectly matched. Increased summer flows are a consequence of increased glacial melt for a few decades. The eventual disappearance of glaciers is projected to cause a reduction in flow, not an increase. Pair 3 is correctly matched. The Himalayan region has undergone substantial changes from extensive land use like deforestation and agricultural practices, leading to enhanced sedimentation and pollution of lakes.
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TextbookHard
Q28.Consider the following statements regarding the impacts of global warming and sea level rise:
1. Sea water percolation resulting from coastal inundation primarily enhances the availability of freshwater supplies.
2. Warming seas are expected to fuel less intense tropical storms, reducing cyclone risk for coastal states.
3. The rise in sea level is exclusively caused by the melting of ice sheets.
Explanation: Statement 1 is incorrect. Sea water percolation due to inundations can diminish freshwater supplies, not enhance them. Statement 2 is incorrect. Warming seas are projected to fuel more intense, not less intense, tropical storms. Statement 3 is incorrect. Sea level rise is a result of both the thermal expansion of seawater as it warms and the melting of ice sheets.
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TextbookHard
Q29.With reference to the impacts of sea level rise on India, consider the following statements:
1. Among the coastal states, Orissa is projected to be the worst hit in terms of losing the largest percentage of its total land area.
2. The existence of coral reefs in India's biosphere reserves is threatened by rising sea levels due to their sensitivity to changes in water salinity.
3. People living in the Ganges Delta are largely shielded from the flood risks associated with rising sea levels.
Explanation: Statement 1 is incorrect. Goa, not Orissa, is identified as being the worst hit in terms of losing a large percentage of its total land area. Orissa is mentioned in the context of experiencing worse cyclones. Statement 2 is correct. Coral reefs are saline-sensitive, and the rising sea level threatens their existence. Statement 3 is incorrect. People living in the Ganges Delta share the flood risks associated with rising sea levels.
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TextbookHard
Q30.Consider the following statements:
Statement I: Satellite observations since the early 1990s indicate that the rate of sea level rise per year has been significantly higher than the average during the previous half-century.
Statement II: The primary physical mechanisms causing the rise in sea level are the thermal expansion of ocean water and the melting of ice sheets.
Which one of the following is correct in respect of the above statements?
Explanation: Both statements are factually correct. Statement I describes an observed phenomenon (accelerated sea level rise) based on satellite data. Statement II describes the underlying physical causes (thermal expansion and ice melt) for this phenomenon. Therefore, Statement II provides the correct scientific explanation for the observation detailed in Statement I.
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TextbookHard
Q31.With reference to the Himalayan Ecosystem, consider the following statements:
1. The Himalayan Ecosystem is home to the largest amount of glaciers in the world.
2. An increase in the phenomenon of Glacial Lake Outburst Floods (GLOFs) is predicted primarily for the western Himalayas.
3. The perennial rivers originating from the Himalayan glaciers are considered a lifeline solely for India.
Explanation: Statement 1 is incorrect. The Himalayan Ecosystem is home to the largest amount of glaciers after the North and the South Poles, not the largest in the world. Statement 2 is incorrect. An increase in GLOFs is predicted for the eastern and central Himalayas, not the western Himalayas. Statement 3 is incorrect. The Himalayan Ecosystem is considered a lifeline not only to India but also to neighboring countries such as China, Pakistan, and Nepal.
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TextbookHard
Q32.Consider the following statements regarding Coastal and Marine Ecosystems:
1. Ocean acidification, resulting from increased dissolved carbonic acid, is expected to be beneficial for shell-forming organisms.
2. Wetlands, such as mangrove forests, function as natural barriers against flooding and cyclones.
3. The most explicit event cited as an example of climate change affecting the marine ecosystem is the expansion of deserts.
Explanation: Statement 1 is incorrect. Ocean acidification is expected to negatively affect shell-forming organisms and corals. Statement 2 is correct. The wetlands act as a natural barrier to flooding and cyclones. Statement 3 is incorrect. The most explicit event mentioned in the perspective of climate change affecting the marine ecosystem is the example of coral bleaching, not desert expansion.
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TextbookHard
Q33.Consider the following pairs:
1. Indo-Gangetic Ecosystem : Primarily a monsoon-dependent ecosystem
2. Peninsular Ecosystem : Primarily an agricultural ecosystem
3. Indian Desert Ecosystem : Occupies approximately 38.8% of India's geographical area
How many of the above pairs are correctly matched?
Explanation: Pair 1 is incorrectly matched. The Indo-Gangetic Ecosystem is described as primarily an agricultural ecosystem. The Peninsular Ecosystem is described as basically a monsoon-dependent ecosystem. Pair 2 is incorrectly matched. The Peninsular Ecosystem is described as a monsoon-dependent ecosystem, while the Indo-Gangetic Ecosystem is described as primarily an agricultural one. Pair 3 is correctly matched. The National Environment Policy, 2006 states that the Indian Desert Ecosystems occupy 38.8% of the country's geographical area. Therefore, only one pair is correctly matched.
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TextbookHard
Q34.Consider the following statements regarding the impact of climate change on the spread of infectious diseases:
1. Rising temperatures have led to the first-time reporting of Dengue fever cases in countries like Nepal and Bhutan.
2. Flooding creates opportunities for the breeding of disease-carrying insects such as mosquitoes.
3. Endemic mortality due to diarrhoeal disease is expected to rise in East, South, and South-East Asia due to projected changes in the hydrological cycle.
Explanation: Statement 1 is incorrect. Due to rising temperatures, malaria cases, not Dengue fever, are now being reported for the first time from countries like Nepal and Bhutan. Statement 2 is correct. Flooding can create stagnant water bodies, which are ideal breeding grounds for insects like mosquitoes that transmit diseases. Statement 3 is correct. Mortality due to diarrhoeal disease, which is associated with floods and droughts, is projected to increase in East, South, and South-East Asia because of changes in the hydrological cycle.
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TextbookHard
Q35.With reference to the health impacts linked to Green House Gas (GHG) emissions, consider the following statements:
1. GHG emissions have been responsible for the depletion of the stratospheric ozone layer.
2. Higher exposure to ultra-violet rays resulting from ozone depletion can lead to suppression of the human immune system.
3. Depletion of the ozone layer is a primary factor in the increased rates of diarrhoeal disease.
Explanation: Statement 1 is correct. The emission of Green House Gases has been identified as responsible for the depletion of the ozone layer. Statement 2 is correct. Depletion of stratospheric ozone leads to higher exposure to ultra-violet rays, which is thought to cause suppression of the immune system, in addition to skin cancer and cataracts. Statement 3 is incorrect. Increased rates of diarrhoeal disease are primarily associated with floods and droughts that compromise hygiene and contaminate freshwater supplies, not with the depletion of the ozone layer.
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TextbookHard
Q36.Consider the following statements regarding the effects of climate change on agriculture and nutrition:
1. In some African countries, yields from rain-fed agriculture could be reduced by up to 80 per cent by 2020.
2. Stress on food supplies from decreased crop yields is expected to lead to a wider prevalence of malnutrition.
3. The negative effects of climate change on health are concentrated on poor populations, thereby widening the inequality gap.
Explanation: Statement 1 is incorrect. The projected reduction in yields from rain-fed agriculture in some African countries by 2020 is up to 50 per cent, not 80 per cent. Statement 2 is correct. A decrease in crop yields places stress on food supplies, which ultimately translates into a wider prevalence of malnutrition and undernutrition. Statement 3 is correct. The negative health effects are concentrated on poor populations that have already compromised health prospects, which widens the inequality gap between the most and least privileged.
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TextbookHard
Q37.Consider the following statements regarding geologic carbon sequestration mechanisms:
1. Geologic sequestration primarily relies on increasing carbon fixation through photosynthesis in underground rock formations.
2. Hydrodynamic trapping involves the dissolution of carbon dioxide into liquids such as water or oil.
3. In mineral carbonation, carbon dioxide reacts with specific minerals to form stable carbonate compounds.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Increasing carbon fixation through photosynthesis is a mechanism of Terrestrial Sequestration, not Geologic Sequestration. Statement 2 is incorrect. The dissolution of carbon dioxide into a liquid is characteristic of Solubility Trapping. Hydrodynamic Trapping involves containing gaseous CO2 under a low-permeability cap rock. Statement 3 is correct. Mineral carbonation is a process where carbon dioxide reacts with minerals containing calcium, iron, and magnesium to form stable carbonate compounds.
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TextbookHard
Q38.With reference to the Carbon Capture, Utilisation, and Storage (CCUS) policy framework by NITI Aayog, consider the following statements:
1. The framework aims for deep decarbonization from hard-to-abate sectors such as steel and cement.
2. CCUS technologies are designed to extract carbon dioxide from both flue gas emissions and directly from the atmosphere.
3. The utilization of captured CO2 includes its conversion into value-added products like polymers and bio-plastics.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. The policy framework explicitly targets deep decarbonization from hard-to-abate sectors, mentioning steel and cement as examples. Statement 2 is correct. CCUS techniques and technologies are designed to extract carbon dioxide from both flue gas emissions and the atmosphere. Statement 3 is correct. The conversion of captured CO2 into polymers, including bio-plastics, is listed as one of the value-added opportunities with substantial market potential.
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TextbookMedium
Q39.Consider the following statements regarding carbon sinks and sequestration types:
1. Depleted oil reserves and unmineable mines are classified as natural carbon sinks.
2. Ocean sequestration is considered to have the largest potential for near-term application among sequestration technologies.
3. Terrestrial sequestration can be enhanced by slowing down the decomposition of organic matter.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Depleted oil reserves and unmineable mines are categorized as artificial sinks. Natural sinks include oceans, forests, and soil. Statement 2 is incorrect. Geologic Sequestration, not Ocean Sequestration, is thought to have the largest potential for near-term application. Statement 3 is correct. Terrestrial sequestration involves enhancing carbon uptake in natural sinks, and one of the methods to achieve this is by slowing down or reducing the decomposition of organic matter.
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TextbookHard
Q40.Consider the following statements regarding Green and Blue Carbon:
1. Per square mile, coastal blue carbon ecosystems remove atmospheric carbon at rates that are generally lower than those of mature tropical forests.
2. Green carbon is the carbon stored in the plants and soil of terrestrial ecosystems, forming a vital part of the global carbon cycle.
3. Coastal ecosystems like mangroves can store up to five times more carbon in their organic-rich sediments compared to many temperate and tropical forests.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Coastal ecosystems such as tidal marshes, mangroves, and seagrasses can remove carbon from the atmosphere and oceans at rates higher than each square mile of mature tropical forests. Statement 2 is correct. Green carbon is defined as carbon removed by photosynthesis and stored in the plants and soil of natural ecosystems. Statement 3 is correct. Coastal ecosystems have been found to store huge quantities of carbon in organic-rich sediments, up to 5 times more carbon than many temperate and tropical forests.
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TextbookHard
Q41.With reference to the Blue Carbon Initiative and associated international cooperation, consider the following statements:
1. The Blue Carbon Initiative is a legally binding international treaty focused on mitigating climate change through coastal ecosystem restoration.
2. A key objective of the initiative is the development of incentive mechanisms, such as carbon payment schemes, for Blue Carbon projects.
3. The Intergovernmental Oceanic Commission (IOC) of UNESCO is one of the primary organizations collaborating on the development of policy mechanisms for Blue Carbon ecosystems.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The Blue Carbon Initiative is described as the first integrated program with a comprehensive and coordinated global agenda; it is not characterized as a legally binding treaty. Statement 2 is correct. The initiative's agenda includes developing incentive mechanisms like carbon payment schemes for Blue Carbon projects. Statement 3 is correct. The Intergovernmental Oceanic Commission (IOC) of UNESCO is explicitly mentioned as collaborating with Conservation International (CI) and the International Union for Conservation of Nature (IUCN) on Blue Carbon efforts.
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TextbookHard
Q42.Consider the following statements:
1. Green and blue carbon are forms of carbon that contribute to atmospheric greenhouse gases, while black and brown carbon sequester them.
2. Africa's Great Green Wall project is an initiative aimed at stopping the Sahara Desert from spreading further south.
3. Blue carbon ecosystems, such as tidal marshes and mangroves, are found on every continent without exception.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The relationship is reversed. Green and blue carbon sequester atmospheric greenhouse gases, whereas black and brown carbon contribute to them. Statement 2 is correct. The project's goal is to plant an arc of trees across Africa to stop the Sahara Desert from spreading further south. Statement 3 is incorrect. These ecosystems are found on all continents except Antarctica.
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TextbookHard
Q43.Consider the following statements regarding carbon credits:
1. A single carbon credit represents a tradeable permit equivalent to the right to emit one tonne of carbon dioxide equivalent.
2. An organization earns a carbon credit by producing one tonne more of carbon dioxide equivalent than its permitted standard level.
3. Carbon credits are primarily traded on commodity exchanges, with India's MCX being the first exchange in Asia to facilitate such trades.
Explanation: Statement 1 is correct. A carbon credit is defined as a tradeable certificate or permit that represents the right to emit one tonne of carbon or carbon dioxide equivalent (tCO2e). Statement 2 is incorrect. An organization earns a carbon credit by producing one tonne less of carbon or carbon dioxide equivalent than the standard level allowed, not more. This represents a reduction in emissions. Statement 3 is correct. Carbon, like other commodities, is traded on exchanges such as India's Multi Commodity Exchange (MCX), which was the first in Asia to trade carbon credits.
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TextbookHard
Q44.With reference to the mechanisms available to companies under international climate frameworks, consider the following statements:
1. A company in a developed country can meet its emission reduction targets by helping a company in a developing country adopt eco-friendly technology.
2. When a project in a developing country earns carbon credits with assistance from a developed country company, the entirety of these credits can be transferred to the partner company in the developed country.
3. The Kyoto Protocol established gas emission norms for companies that were to be met by 2012.
Explanation: Statement 1 is correct. A company can tie up with entities in developing nations to help them set up new, eco-friendly technology, thereby helping the developing country's company earn credits. Statement 2 is incorrect. Only a portion of the carbon credits earned by the company in the developing country can be transferred to the company in the developed country. Statement 3 is correct. Countries signatory to the Kyoto Protocol under the UNFCCC laid down gas emission norms for their companies, with a target year of 2012 mentioned in the framework.
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TextbookHard
Q45.Consider the following statements regarding the quality criteria for a credible carbon offset:
1. The principle of 'additionality' ensures that an emission reduction in one area does not cause an increase in emissions somewhere else.
2. The principle of 'leakage' ensures that the reduction in emissions would not have occurred without the specific carbon finance investment.
3. A credible offset must be retired from the carbon market to prevent it from being counted more than once.
Explanation: Statement 1 is incorrect. This statement describes the concept of addressing 'leakage'. The principle of 'additionality' is the proof that the emission reduction would not have happened without the carbon finance. Statement 2 is incorrect. This statement describes the principle of 'additionality'. The concept of 'leakage' refers to the risk that an emission reduction in one area causes an increase in emissions somewhere else. Statement 3 is correct. For a carbon offset to be credible, it must be retired from the carbon market so it cannot be double counted.
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TextbookHard
Q46.With reference to Carbon Tax and 'cap and trade' systems, consider the following statements:
1. A carbon tax is generally considered more complex and slower to implement than the 'cap and trade' method due to extensive legalities.
2. Unlike the 'cap and trade' system, a carbon tax is stated to offer greater predictability in energy prices, which can aid investment in alternatives.
3. A key advantage of a carbon tax is its resistance to manipulation by special interest groups due to its inherent simplicity.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. A carbon tax could be put into use much quicker compared to the legalities that go along with the 'cap and trade' method. Statement 2 is correct. One of the primary reasons a carbon tax could be more beneficial is its predictability, which could help predict energy prices and encourage investments in energy efficiency and alternate fuels. Statement 3 is correct. Due to its simplicity, a carbon tax offers less opportunity for manipulation by special interest groups.
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TextbookHard
Q47.Consider the following statements regarding international trade and carbon regulations:
Statement I: India has officially stated its intention to challenge any 'border carbon adjustment' measures imposed by developed nations at the World Trade Organization.
Statement II: Both the United States and the European Union have discussed imposing tariffs on goods imported from countries with less stringent regulations on greenhouse gas emissions.
Which one of the following is correct in respect of the above statements?
Explanation: Statement I is correct. The Indian government has indicated it will bring a WTO challenge against any 'carbon taxes' that rich countries impose on Indian imports. Statement II is also correct. Both the United States and the European Union have discussed the possibility of imposing tariffs or other forms of 'border carbon adjustment'. Statement II provides the direct context and cause for the policy reaction described in Statement I; the discussion of such tariffs by the US and EU is the reason for India's stated plan to challenge them at the WTO. Therefore, Statement II is the correct explanation for Statement I.
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TextbookHard
Q48.Consider the following statements regarding the features and implementation of a Carbon Tax:
1. A carbon tax is levied based on the total energy output of a fuel, irrespective of its carbon content.
2. For effective implementation, a carbon tax is typically introduced at a high rate and then gradually decreased as industries adapt.
3. One of the mechanisms associated with a carbon tax system is the potential for rebates to be issued to the public.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The tax is based on the amount of carbon contained in a fuel, not its total energy output. Statement 2 is incorrect. The implementation of a carbon tax would be gradual, starting at a low amount and increasing over time to allow industry and technology to develop. Statement 3 is correct. Similar to other forms of taxes, a carbon tax could be open for rebates to the public.
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Current AffairsMedium
Q49.Consider the following statements regarding the impact of climate change on public health:
1. Increased frequency of flooding can lead to the contamination of freshwater supplies, increasing the incidence of diarrhoeal diseases.
2. Warmer climates can enable the geographical expansion of vector-borne diseases like malaria into previously colder, high-altitude regions.
3. Climate change-induced hydrological shifts are projected to primarily affect diarrhoeal disease mortality in developed countries of North America and Europe.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. Flooding can overwhelm sanitation systems and contaminate water sources, leading to a higher risk of waterborne diseases like diarrhoea. Statement 2 is correct. Rising temperatures allow disease vectors, such as mosquitoes carrying malaria, to survive and thrive in regions that were previously too cold for them, like mountainous areas. Statement 3 is incorrect. The burden of diarrhoeal diseases linked to climate-induced hydrological changes is projected to fall most heavily on developing regions, particularly in East, South, and South-East Asia, due to factors like vulnerable infrastructure and limited adaptive capacity, not primarily on developed nations in North America and Europe.
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Current AffairsHard
Q50.With reference to the health impacts of atmospheric changes, consider the following statements:
1. The primary cause of stratospheric ozone depletion is the accumulation of greenhouse gases such as carbon dioxide and methane.
2. A reduction in stratospheric ozone leads to increased exposure to ultraviolet (UV) radiation, which can elevate the risk of skin cancer.
3. Increased UV radiation resulting from ozone layer depletion is also linked to a higher incidence of eye diseases like cataracts.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The primary cause of stratospheric ozone depletion is the emission of Ozone Depleting Substances (ODS), such as chlorofluorocarbons (CFCs), not greenhouse gases which are the primary drivers of global warming. This is a critical scientific distinction. Statement 2 is correct. The stratospheric ozone layer filters harmful UV-B radiation from the sun. Its depletion allows more of this radiation to reach the Earth's surface, increasing the risk of DNA damage that leads to skin cancer. Statement 3 is correct. Prolonged exposure to UV radiation can damage the proteins in the lens of the eye, leading to the formation of cataracts.
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Current AffairsMedium
Q51.Consider the following two statements:
Statement-I: Climate change is projected to worsen malnutrition and undernutrition, particularly in many developing countries.
Statement-II: Rising temperatures and altered rainfall patterns are expected to decrease crop yields from rain-fed agriculture, a key food source in these regions.
Which one of the following is correct in respect of the above two statements?
Explanation: Statement-I is a well-established projection regarding the health impacts of climate change. Food insecurity is a major pathway through which climate change affects human health, leading to higher rates of malnutrition. Statement-II provides the direct causal mechanism for the phenomenon described in Statement-I. The stress on agriculture, especially rain-fed systems vital for many developing nations, due to climatic shifts directly leads to reduced food availability and consequently, increased malnutrition. Therefore, Statement-II is the correct explanation for Statement-I.
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Current AffairsHard
Q52.With reference to the impacts of climate change on Himalayan river systems, consider the following statements:
1. Climate change-induced glacial melt is projected to cause a permanent and sustained increase in summer flows of major Himalayan rivers.
2. Extensive land-use changes, including deforestation and urbanization in the Himalayan region, can contribute to the frequency of hydrological disasters.
3. The phenomenon of significant glacial retreat in the Himalayas has been observed only since the beginning of the 21st century.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. While glacial melt may initially increase summer flows, this effect is temporary. As glaciers continue to shrink and disappear, the river flows are expected to decrease significantly in the long run. Statement 2 is correct. Anthropogenic activities like deforestation and urbanization alter the natural landscape, increasing surface runoff and soil erosion, which can exacerbate hydrological events like floods and landslides. Statement 3 is incorrect. Scientific records and evidence indicate that some Himalayan glaciers, such as the Gangotri, have been retreating significantly since the 19th century, not just from the 21st century.
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Current AffairsMedium
Q53.Consider the following statements regarding water consumption and availability in India:
1. The agriculture sector is the single largest consumer of water, utilizing more than two-thirds of the total available water.
2. Projections suggest that with the implementation of judicious use policies, the industrial sector will overtake agriculture as the largest water consumer by 2050.
3. The rapid expansion of groundwater abstraction structures has led to falling water tables, threatening the long-term sustainability of this resource.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. The agriculture sector in India is highly water-intensive and accounts for approximately 70% of the country's water consumption. Statement 2 is incorrect. While efficiency measures are expected to reduce agriculture's share of water consumption, it is still projected to remain the largest consuming sector by 2050, not be overtaken by the industrial sector. Statement 3 is correct. The proliferation of wells and borewells for agriculture, industry, and domestic use has led to over-extraction of groundwater in many parts of India, resulting in declining water levels and compromising the resource's sustainability.
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Current AffairsHard
Q54.Consider the following statements:
Statement-I: Climate change is expected to increase water stress in coastal areas through the salinisation of groundwater aquifers.
Statement-II: This salinisation primarily occurs because rising sea levels push the saltwater interface further inland, leading to the intrusion of seawater into freshwater aquifers.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Salinisation of freshwater resources, particularly groundwater, is a major threat in coastal zones, and climate change is a key driver exacerbating this problem. Statement-II is also correct and provides the primary scientific mechanism for the phenomenon described in Statement-I. Global warming causes sea levels to rise. This increased hydrostatic pressure from the sea pushes the underground boundary between freshwater and saltwater further inland, causing saltwater to contaminate coastal aquifers that are crucial for drinking water and agriculture. Therefore, Statement-II is the correct explanation for Statement-I.
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Current AffairsHard
Q55.Consider the following statements regarding the impact of climate change on Himalayan river systems:
Statement-I: The accelerated retreat of Himalayan glaciers is projected to cause a sustained, long-term increase in the summer flows of major North Indian rivers.
Statement-II: As glaciers diminish, the initial increase in meltwater runoff eventually gives way to a reduction in river flows, threatening water security in the long run.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is incorrect. The accelerated melting of glaciers leads to a temporary, not a sustained long-term, increase in river flows. This phenomenon is often referred to as reaching 'peak water,' after which flows will decline as the glacial ice volume shrinks. The term 'sustained, long-term' makes the statement factually wrong. Statement-II is correct. It accurately describes the hydrological trajectory of glacier-fed rivers under climate change. Initially, as glaciers melt faster, runoff increases. However, as the glacial ice volume shrinks past a critical point, there is less ice to melt, leading to a subsequent and often sharp reduction in river flows. This poses a significant threat to long-term water security for downstream populations.
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Current AffairsMedium
Q56.With reference to India's water and food security challenges, consider the following statements:
1. Currently, the industrial sector is the largest consumer of water in India, surpassing the demand from the agricultural sector.
2. Land use changes, such as deforestation and urbanization in the Himalayan region, have been identified as contributing factors to hydrological disasters.
3. Rising sea levels are projected to worsen water scarcity in coastal regions through the increased salinisation of groundwater.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The agricultural sector is the largest consumer of water in India. According to data from the Ministry of Jal Shakti and NITI Aayog, agriculture accounts for nearly 90% of the total annual freshwater withdrawals in the country. The industrial sector's consumption is significantly lower, at less than 10%. Statement 2 is correct. Scientific studies and government reports, including those from the National Institute of Disaster Management (NIDM), have established a direct correlation between anthropogenic land use changes (deforestation, road construction, urbanization) in the Himalayas and the increased frequency of hydrological disasters like flash floods and landslides. These activities destabilize slopes and reduce the water retention capacity of the soil. Statement 3 is correct. As sea levels rise due to climate change, the pressure balance between coastal freshwater aquifers and the sea is altered. This leads to saltwater intrusion, where saline water moves further inland and contaminates groundwater sources. This phenomenon is a major threat to freshwater availability in India's extensive coastal zones, as highlighted in reports by the Intergovernmental Panel on Climate Change (IPCC). Therefore, only two statements (2 and 3) are correct.
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Current AffairsMedium
Q57.Consider the following phenomena related to India's water resources:
1. A significant increase in the number of groundwater abstraction structures.
2. Historical shifts in the courses of major rivers in the Indo-Gangetic Plain.
3. A decline in the sustainability of groundwater resources due to falling water tables.
Which of the above are identified as significant challenges or occurrences impacting water security in India?
Explanation: All three statements describe significant and well-documented phenomena impacting India's water security.
* **Statement 1 is correct:** Following the Green Revolution, India experienced a massive increase in the installation of groundwater abstraction structures (tube wells, borewells) to support intensive agriculture. This has made India the largest user of groundwater globally, placing immense pressure on this resource.
* **Statement 2 is correct:** The rivers in the vast, alluvial Indo-Gangetic Plain are known for their dynamic nature. Rivers like the Kosi ('Sorrow of Bihar'), Gandak, and Tista have historically shifted their courses (a process known as avulsion) multiple times. These shifts cause catastrophic floods, destroy infrastructure and agricultural land, and create immense challenges for water management and regional security.
* **Statement 3 is correct:** This is a direct consequence of the phenomenon in statement 1. The over-extraction of groundwater, far exceeding the rate of natural recharge, has led to a continuous decline in water tables across many parts of India. The Central Ground Water Board (CGWB) has identified numerous administrative blocks as 'Over-Exploited' or 'Critical', indicating a severe threat to the long-term sustainability of groundwater resources, which is a cornerstone of water security.
Since all three statements represent major challenges and occurrences related to water security in India, the correct option is d.
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Current AffairsHard
Q58.Consider the following statements regarding glacier-fed river systems:
Statement-I: In the context of climate change, many glacier-fed Himalayan river systems are projected to experience a temporary increase in their annual water flow.
Statement-II: This phenomenon is due to accelerated glacial melting, which will eventually lead to a permanent and sustained increase in the base flow of these rivers as they stabilize.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Accelerated glacial melt due to rising temperatures initially increases water flow, leading to higher discharge in rivers during summer for a few decades. This is often referred to as 'peak water'. Statement-II is incorrect. While accelerated melting is the cause, the long-term consequence is not a permanent increase in base flow. Once the glaciers shrink significantly or disappear, the water flow will drastically reduce, leading to diminished flows, not a sustained increase. This inverts the long-term process outcome.
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Current AffairsMedium
Q59.With reference to water resources in India, consider the following statements:
1. The agricultural sector is the single largest consumer of water, utilizing more than two-thirds of the total available water.
2. Future projections suggest that due to improved efficiency, the industrial sector is expected to surpass the agricultural sector as the largest water consumer.
3. In coastal regions, increased groundwater salinisation is an anticipated consequence of sea-level rise.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. The agriculture sector is the largest water consumer in India, accounting for approximately 70% of water use. Statement 2 is incorrect. While efficiency gains may reduce agriculture's share of total water use in the future, it is projected to remain the largest water-consuming sector. The industrial sector is not expected to surpass it. This statement inverts the projected outcome. Statement 3 is correct. Climate change-induced sea-level rise is expected to exacerbate the intrusion of saltwater into coastal aquifers, leading to increased groundwater salinisation. Therefore, two statements (1 and 3) are correct.
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Current AffairsHard
Q60.Consider the following statements regarding the hydrological characteristics of the Indo-Gangetic Plain and its associated river systems:
1. Extensive land use changes, such as deforestation and urbanization in the Himalayan catchment areas, contribute to an increased frequency of hydrological disasters in the plains.
2. The phenomenon of major rivers like Kosi and Ghaghara avulsing, or changing their course, has been a recurring historical feature in the region.
3. Enhanced sedimentation in rivers, resulting from upstream erosion, generally leads to the deepening of river channels and a subsequent reduction in flood risk.
Which of the statements given above are correct?
Explanation: Statement 1 is correct. Deforestation, improper agricultural practices, and urbanization in the Himalayas increase surface runoff and erosion, leading to more frequent hydrological disasters like floods and landslides downstream in the plains. Statement 2 is correct. The Indo-Gangetic Plain is known for river avulsions. Rivers like the Kosi, Gandak, and Ghaghara have historically changed their courses multiple times due to high sediment load and low gradients. Statement 3 is incorrect. This is a process inversion. Enhanced sedimentation leads to aggradation, which is the raising of the river bed. A raised river bed has reduced carrying capacity, which increases, not reduces, the risk of flooding and course changes.
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Current AffairsHard
Q61.With reference to groundwater resource management in India, consider the following statements:
1. The industrial sector is currently the largest consumer of water, surpassing the demand from the agricultural sector.
2. An increase in groundwater abstraction structures directly leads to a reduction in the recharging time for underlying water tables.
3. The phenomenon of falling groundwater levels is primarily restricted to the arid and semi-arid regions of the country.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. The agriculture sector is the largest consumer of water in India, accounting for approximately 70% of total usage. Statement 2 is incorrect. Increased abstraction and falling water tables mean that the natural process of recharging takes longer, or the rate of recharge is insufficient to replenish the aquifer; it does not reduce the recharging time. Statement 3 is incorrect. The problem of falling groundwater levels is a widespread issue reported from various parts of India, including agriculturally intensive and urbanized zones, not just arid regions.
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Current AffairsHard
Q62.Consider the following statements:
Statement-I: Accelerated melting of Himalayan glaciers due to climate change is projected to cause a long-term, permanent increase in the summer flows of perennial North Indian rivers.
Statement-II: Himalayan glaciers are a crucial source of water for the Indus, Ganga, and Brahmaputra river systems, especially during the dry season.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is incorrect. Accelerated glacial melt may initially increase river flows (a phenomenon known as 'peak water'), but this is a short-term effect. In the long term, as glaciers shrink, river flows, particularly during dry seasons, are projected to decrease significantly. It will not cause a 'permanent increase'. Statement-II is correct. The Himalayan glaciers act as a vital water tower. The meltwater they release during the warm, dry season is critical for sustaining the flow of the Indus, Ganga, and Brahmaputra rivers, supporting agriculture and livelihoods for millions downstream.
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Current AffairsHard
Q63.Consider the following statements regarding water resource challenges in India:
1. In coastal regions, sea-level rise is a significant driver of groundwater salinisation, thereby reducing freshwater availability.
2. The Central Ground Water Authority (CGWA) is a statutory body constituted under the Water (Prevention and Control of Pollution) Act, 1974.
3. Land-use changes such as deforestation and urbanization in the Himalayan region contribute to enhanced sedimentation in rivers and lakes.
Which of the statements given above are correct?
Explanation: Statement 1 is correct. Rising sea levels in coastal areas lead to saltwater intrusion into freshwater aquifers, a process known as salinisation, which contaminates and reduces the availability of potable groundwater. Statement 2 is incorrect. The Central Ground Water Authority (CGWA) was constituted under Section 3(3) of the Environment (Protection) Act, 1986, to regulate and control groundwater development and management. It was not formed under the Water Act, 1974. Statement 3 is correct. Extensive land-use changes, including deforestation and construction activities in the fragile Himalayan ecosystem, increase soil erosion, leading to higher sediment loads in rivers and lakes, which affects their hydrology and water quality.
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Current AffairsHard
Q64.Consider the following statements:
Statement-I: In the initial decades of accelerated climate change, many glacier-fed Himalayan rivers are projected to experience a temporary increase in summer water flow.
Statement-II: This increase is a direct consequence of enhanced glacial melt rates releasing larger volumes of water, a phase that precedes a long-term decline in flow as glacial mass is depleted.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Accelerated warming leads to increased melting of glaciers, which temporarily boosts the volume of water in glacier-fed rivers during summer months. Statement-II is also correct and provides the precise scientific reason for the phenomenon described in Statement-I. The initial surge in water flow is due to the melting of the glacier's 'ice bank'. However, as the glacier's total volume shrinks, this effect will diminish, leading to a subsequent reduction in river flows.
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Current AffairsHard
Q65.With reference to the impacts of climate change on India's water resources, consider the following statements:
1. Sea-level rise contributes to water stress in coastal regions by causing saline intrusion into freshwater groundwater aquifers.
2. The accelerated melting of Himalayan glaciers is expected to cause a permanent and sustained increase in the annual flow of North Indian rivers.
3. Projections indicate that by 2050, the industrial sector will surpass the agricultural sector as the largest consumer of water in India.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. Sea level rise increases hydrostatic pressure, causing seawater to push inland and contaminate coastal groundwater sources, a process known as saltwater intrusion. Statement 2 is incorrect. The increased flow from glacial melt is a temporary phenomenon. As glaciers continue to shrink and disappear, the river flows are expected to decrease significantly in the long run. This is a classic process inversion. Statement 3 is incorrect. While the percentage share of water used by agriculture is projected to decrease, it will still remain the largest consuming sector in India by 2050.
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Current AffairsMedium
Q66.Consider the following statements regarding the ecological dynamics of the Himalayan and Indo-Gangetic Plain regions:
1. Extensive land-use changes, including deforestation and urbanization, in the Himalayan region have contributed to an increase in the frequency of hydrological disasters.
2. The phenomenon of river avulsion, or the rapid change in a river's course, is a significant geological process historically observed in multiple rivers of the Indo-Gangetic plains.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. Human activities such as deforestation, improper agricultural practices, and urbanization in the fragile Himalayan ecosystem have led to increased soil erosion, landslides, and altered hydrological regimes, thereby increasing the frequency and intensity of disasters like flash floods. Statement 2 is correct. River avulsion is not limited to a single river. Historically, major rivers in the Indo-Gangetic plains, including the Kosi, Ganga, Ghaghara, Son, Indus, and Yamuna, have been known to change their courses, posing significant environmental and social challenges.
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Current AffairsHard
Q67.Consider the following statements regarding the impacts of climate change on India's resources:
1. Increased glacial melt in the Himalayas is expected to permanently augment summer flows in major perennial rivers.
2. Despite potential efficiency improvements, the agriculture sector is projected to remain the single largest consumer of water in India by the mid-21st century.
3. In coastal regions, groundwater salinisation is primarily a consequence of over-extraction for agriculture rather than sea-level rise.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. The increased flow from glacial melt is a temporary phenomenon, often referred to as 'peak water'. Scientific projections indicate that after a few decades of increased flow, river volumes will decline significantly as the glaciers recede and eventually disappear. The augmentation is therefore not permanent. Statement 2 is correct. Due to its vast scale and current water usage patterns, the agriculture sector is the largest consumer of water in India. Even with projected improvements in irrigation efficiency, its overall demand is so high that it is projected to remain the single largest water-consuming sector by the mid-21st century. Statement 3 is incorrect. Sea-level rise, a direct impact of climate change, increases the hydraulic pressure of seawater on coastal freshwater aquifers, causing saltwater intrusion. While over-extraction for agriculture can significantly exacerbate this problem by lowering the freshwater table, sea-level rise is a fundamental and accelerating driver. Framing the issue as primarily one of over-extraction *rather than* sea-level rise misrepresents the direct and growing threat posed by climate change. Therefore, only one statement is correct.
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Current AffairsMedium
Q68.Consider the following statements:
Statement-I: In the coming decades, increased glacial melt due to climate change is expected to initially increase summer flows in some Himalayan river systems.
Statement-II: Himalayan glaciers, such as the Gangotri, have shown a consistent trend of advancement and expansion in recent decades, enhancing their water-holding capacity.
Explanation: Statement-I is correct. Climate change is causing glaciers to melt at an accelerated rate, which initially increases the volume of water flowing into rivers during summer months. Statement-II is incorrect. There is widespread evidence, including for the Gangotri glacier, of significant retreat and shrinking, not advancement or expansion. The retreat of glaciers is the cause of the increased meltwater, not their expansion.
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Current AffairsHard
Q69.Consider the following pairs:
1. Glacial Retreat : Gangotri
2. River Course Shifting : Kosi
3. Groundwater Salinisation : Indo-Gangetic Plain
How many of the pairs given above are correctly matched?
Explanation: Pair 1 is correctly matched. The Gangotri glacier is a well-documented example of a retreating Himalayan glacier. Pair 2 is correctly matched. The Kosi river, which flows through the Indo-Gangetic plain, is historically known for its frequent and devastating course changes. Pair 3 is incorrectly matched. While the Indo-Gangetic Plain faces severe groundwater issues, the specific problem of groundwater salinisation due to sea-level rise is characteristic of coastal areas, not the entire inland plain. Therefore, only two pairs are correctly matched.
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Current AffairsHard
Q70.Consider the following statements regarding the impact of climate change on Himalayan river systems:
Statement-I: The retreat of Himalayan glaciers is expected to cause an immediate and sustained reduction in summer flows of major perennial rivers.
Statement-II: Glacial meltwater significantly contributes to river discharge, and the depletion of glaciers will eventually diminish this source, impacting long-term water availability.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is incorrect. Glacial retreat is expected to initially increase summer flows for a few decades due to accelerated melting. Only after the glaciers have significantly shrunk will the flows reduce. Statement-II is correct. It accurately describes the long-term consequence of glacier disappearance on river systems that depend on them for meltwater.
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Current AffairsHard
Q71.With reference to water resources and their consumption in India, consider the following statements:
1. The industrial sector currently accounts for the largest consumption of water, surpassing the agricultural sector.
2. Rising sea levels can contribute to the contamination of freshwater aquifers in coastal areas through salinisation.
3. The falling groundwater levels across the country are primarily a result of a reduction in the recharging time of aquifers.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The agriculture sector is the largest consumer of water in India, accounting for about 70% of use. Statement 2 is correct. Sea level rise exacerbates water stress in coastal areas by causing saltwater intrusion into groundwater supplies. Statement 3 is incorrect. Falling groundwater levels are a result of overexploitation, where the rate of water withdrawal exceeds the rate of natural recharge; it is not due to a reduction in the time it takes to recharge.
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Current AffairsHard
Q72.Consider the following statements regarding the wider impacts of climate and environmental change:
1. Hydrological instability in the Indo-Gangetic Plain has been historically evidenced by the changing courses of several major rivers.
2. A special report by the World Meteorological Organization (WMO) highlighted that extreme weather could exacerbate stresses for conflict and disrupt food chains.
3. Anthropogenic land use changes, including deforestation in the Himalayan region, are significant drivers of hydrological disasters.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. Historically, major rivers in the Indo-Gangetic Plain have shown significant avulsion (course-changing) behavior. The Kosi River, for instance, is notorious for its frequent and dramatic shifts, earning it the name 'Sorrow of Bihar.' This demonstrates the long-term hydrological instability of the region. Statement 2 is incorrect. The report that extensively linked climate change, extreme weather, land degradation, food security, and conflict is the Special Report on Climate Change and Land (SRCCL) published by the Intergovernmental Panel on Climate Change (IPCC) in 2019. The statement incorrectly attributes this specific synthesis to the World Meteorological Organization (WMO). Statement 3 is correct. Human-induced land use changes, particularly the removal of forest cover in the Himalayas for agriculture, infrastructure, and urbanization, are well-documented drivers of hydrological disasters. Deforestation weakens soil structure, reduces water infiltration, and increases surface runoff, leading to a higher incidence of flash floods, soil erosion, and landslides.
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Current AffairsHard
Q73.Consider the following statements regarding groundwater resources and their depletion:
1. Increased urbanisation enhances groundwater recharge due to the construction of extensive storm-water drainage systems.
2. In coastal regions, over-extraction of groundwater can cause the intrusion of freshwater into saline aquifers.
3. The agricultural sector, despite being the largest consumer of water, is projected to see its proportional demand decrease by mid-century.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. Increased urbanisation involves the sealing of land surfaces with concrete and asphalt, which significantly reduces the percolation of rainwater and thus hinders natural groundwater recharge. Statement 2 is incorrect. It describes the opposite of what happens. Over-extraction of groundwater in coastal areas lowers the freshwater table, reducing the pressure that holds back seawater, leading to the intrusion of saline water into freshwater aquifers, a process known as saltwater intrusion. Statement 3 is correct. The agriculture sector is the largest consumer, currently using about 70% of water, but with efficiency improvements, its share is projected to decline to around 58% by 2050, although it will remain the largest user. Therefore, only one statement is correct.
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Current AffairsHard
Q74.Consider the following statements:
Statement-I: In the near to medium term, climate change may lead to an increase in summer flows for some Himalayan-fed river systems.
Statement-II: Accelerated glacial retreat due to rising temperatures initially releases larger volumes of meltwater, augmenting river flows before the glacial storage is depleted.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. It is a well-documented projection that glacial melt will temporarily increase summer flows in rivers like the Ganga and Brahmaputra. Statement-II is also correct. This phenomenon, often termed 'peak water', occurs because rising temperatures accelerate the melting of glaciers, releasing water that has been stored as ice, thus increasing river discharge. This process provides the direct causal mechanism for the observation in Statement-I. As the glacier shrinks past a tipping point, the meltwater volume will eventually decline, leading to reduced flows in the long term. Therefore, Statement-II is the correct explanation for Statement-I.
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Current AffairsHard
Q75.With reference to water resources management in India, consider the following statements:
1. Land use changes such as deforestation and urbanisation in the Himalayan region have been linked to an increase in the frequency of hydrological disasters.
2. The Central Ground Water Authority (CGWA) was constituted under the provisions of the Water (Prevention and Control of Pollution) Act, 1974.
3. Historically, the phenomenon of major rivers shifting their courses has been observed extensively in the Indo-Gangetic Plain.
How many of the above statements are correct?
Explanation: Statement 1 is correct. Deforestation reduces the water retention capacity of soil, while urbanization creates impermeable surfaces. Both processes increase surface runoff, leading to a higher frequency of hydrological disasters like flash floods and landslides, especially in the geologically sensitive Himalayan region. Statement 2 is incorrect. The Central Ground Water Authority (CGWA) was constituted under Section 3(3) of the Environment (Protection) Act, 1986, to regulate and control groundwater development and management. The Water (Prevention and Control of Pollution) Act, 1974, primarily deals with the prevention and control of water pollution and the establishment of Central and State Pollution Control Boards. Statement 3 is correct. Rivers in the vast, flat Indo-Gangetic Plain carry high sediment loads from the Himalayas. This leads to aggradation (raising of the riverbed), which can cause rivers to breach their banks during floods and carve new channels. The Kosi river, known as the 'Sorrow of Bihar', is a classic example of a river that has frequently shifted its course. Therefore, two statements (1 and 3) are correct.
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Current AffairsMedium
Q76.With reference to the policy framework for Carbon Capture, Utilisation, and Storage (CCUS) in India, consider the following statements:
1. The framework was introduced by the Ministry of Environment, Forest and Climate Change to accelerate CCUS research and development.
2. It identifies hard-to-abate sectors like steel and cement as primary targets for deep decarbonization using CCUS.
3. The framework recognizes the conversion of captured CO2 into products like green urea and methanol as a key opportunity.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The policy framework for CCUS was introduced by NITI Aayog, not the Ministry of Environment, Forest and Climate Change. Statement 2 is correct. The policy explicitly aims to achieve deep decarbonization from hard-to-abate sectors. Statement 3 is correct. The framework highlights opportunities to convert captured CO2 into value-added products, including green urea and chemicals like methanol and ethanol, contributing to a circular economy.
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Current AffairsHard
Q77.Consider the following statements regarding geologic carbon sequestration technologies:
1. Depleted oil reserves and unmineable mines are considered potential sites for the long-term storage of captured carbon dioxide.
2. Solubility trapping is a mechanism where carbon dioxide is dissolved into subsurface liquids like water or oil.
3. Mineral carbonation involves trapping gaseous carbon dioxide under a low-permeability cap rock, similar to how natural gas is stored.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. Geologic sequestration utilizes natural pore spaces in formations, and artificial sinks like depleted oil reserves and unmineable mines are prime examples. Statement 2 is correct. Solubility trapping involves dissolving CO2 into a liquid phase, such as saline water or oil, within a geologic formation. Statement 3 is incorrect. This statement describes hydrodynamic trapping. Mineral carbonation is a different process where CO2 reacts chemically with minerals to form stable solid carbonate compounds.
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Current AffairsHard
Q78.Consider the following pairs:
1. CCUS Product : Enhanced Oil Recovery
2. Sequestration Type : Mineral Carbonation
3. Natural Sink : Depleted oil reserves
How many of the pairs given above are correctly matched?
Explanation: The correctness of the pairs is as follows:
* **Pair 1 is correctly matched.** Enhanced Oil Recovery (EOR) is a key process in the 'Utilization' component of Carbon Capture, Utilization, and Storage (CCUS). Captured CO2 is used as an injectant in mature oil reservoirs to increase oil output. In this context, the captured CO2 is treated as a valuable input or 'product' for an industrial process.
* **Pair 2 is incorrectly matched.** Mineral Carbonation is a specific *process* or *mechanism* for CO2 storage, where CO2 chemically reacts with minerals to form stable, solid carbonates. It is not considered a primary, broad *type* of sequestration. The major types of sequestration are generally categorized as Geologic Sequestration (storage in underground formations), Ocean Sequestration, and Terrestrial Sequestration.
* **Pair 3 is incorrectly matched.** Natural sinks, such as forests, soils, and oceans, are components of the Earth system that naturally absorb and store carbon from the atmosphere. Depleted oil reserves are underground geological formations that can be used for the *artificial* storage of captured CO2. They are engineered repositories and do not naturally absorb CO2 from the atmosphere as part of a natural cycle.
Therefore, only one pair is correctly matched.
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Current AffairsHard
Q79.Consider the following statements regarding geologic carbon sequestration mechanisms:
1. Hydrodynamic trapping involves storing CO2 gas under a high-permeability cap rock to ensure wide dispersion.
2. Mineral carbonation is a process where CO2 reacts with minerals in geologic formations to form stable carbonate compounds.
3. In solubility trapping, CO2 is dissolved into subsurface liquids like water or oil, thereby reducing its mobility.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Hydrodynamic trapping requires a low-permeability cap rock to act as a seal and prevent the buoyant CO2 from escaping to the surface. High permeability would facilitate leakage. Statement 2 is correct. Mineral carbonation is a key long-term trapping mechanism where CO2 chemically reacts with minerals containing calcium, magnesium, and iron to form solid, stable carbonate minerals. Statement 3 is correct. Solubility trapping involves the dissolution of CO2 into formation fluids (brine, oil), which increases the density of the fluid and reduces the risk of upward migration.
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Current AffairsHard
Q80.With reference to the policy framework for Carbon Capture, Utilisation, and Storage (CCUS) in India, consider the following statements:
1. The framework was introduced by the Ministry of Environment, Forest and Climate Change to accelerate CCUS research.
2. It identifies hard-to-abate sectors like steel and cement as primary targets for deep decarbonization using CCUS.
3. The framework makes CCUS mandatory for all new industrial projects to achieve national emission reduction targets.
Which of the statements given above is/are correct?
Explanation: Statement 1 is incorrect. The policy framework for CCUS was introduced by NITI Aayog, not the Ministry of Environment, Forest and Climate Change. Statement 2 is correct. The framework explicitly highlights the importance of CCUS for achieving deep decarbonization in sectors where emissions are difficult to reduce, such as steel and cement. Statement 3 is incorrect. The document is a policy framework to guide development and implementation; it does not impose a blanket mandate making CCUS compulsory for all new industrial projects. It aims to create a practicable framework, not a binding rule for all.
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Current AffairsMedium
Q81.Consider the following statements:
Statement-I: The 'Utilisation' aspect of Carbon Capture, Utilisation, and Storage (CCUS) aligns with the principles of a circular economy.
Statement-II: CCUS technologies enable the conversion of captured carbon dioxide, a waste stream, into value-added products such as fuels, chemicals, and building materials.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. A circular economy aims to eliminate waste and circulate resources. The 'Utilisation' part of CCUS, which treats CO2 not as waste but as a resource, fits this model. Statement-II is also correct. It describes the process of converting captured CO2 into marketable products like methanol, green urea, and construction aggregates. Statement-II provides the direct reason why CCUS contributes to a circular economy—by transforming a waste product into a valuable input for other processes. Therefore, Statement-II is the correct explanation for Statement-I.
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Current AffairsHard
Q82.With reference to the impacts of climate change on the Indian Himalayan Region, consider the following statements:
1. The ecosystem is a critical source of perennial rivers that support the agricultural economies of India and its immediate neighbors.
2. The phenomenon of Glacial Lake Outburst Floods (GLOFs) is projected to increase, primarily in the Western Himalayan sub-regions.
3. The Himalayan glaciers represent the largest concentration of frozen water outside the Arctic and Antarctic regions.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. The Himalayan ecosystem is the source of major perennial rivers, such as the Indus, Ganges, and Brahmaputra, which are lifelines for agriculture in densely populated downstream regions of India and neighboring countries. Statement 2 is incorrect. While the entire Himalayan region is vulnerable to Glacial Lake Outburst Floods (GLOFs), scientific assessments indicate that the risk is projected to increase more significantly in the eastern and central Himalayas, not primarily in the Western sub-regions. This is due to faster rates of glacier retreat and lake formation in the eastern part. Statement 3 is correct. The Hindu Kush Himalayan region is often referred to as the 'Third Pole' because its glaciers contain the largest volume of ice and snow outside the Arctic and Antarctic polar regions.
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Current AffairsHard
Q83.Consider the following statements regarding the impact of climate change on marine ecosystems:
Statement-I: Increasing concentration of atmospheric carbon dioxide is a major driver of coral bleaching and poses a threat to shell-forming marine organisms.
Statement-II: The absorption of excess carbon dioxide by oceans increases the water's pH, making it more alkaline and thereby inhibiting calcification.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. The phenomenon described is a well-documented impact of climate change on marine biodiversity. Higher sea surface temperatures cause coral bleaching, and changes in ocean chemistry affect organisms with calcium carbonate shells. Statement-II is incorrect. It inverts the chemical process. When the ocean absorbs more CO2, it forms carbonic acid, which *lowers* the pH of the seawater, making it more acidic (less alkaline), not more alkaline. This increased acidity is what inhibits calcification in marine organisms.
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Current AffairsMedium
Q84.Consider the following pairs:
Threat Phenomenon : Affected Ecosystem
1. Ocean Acidification : Peninsular River Ecosystem
2. Increased GLOFs : Eastern Himalayan Ecosystem
3. Desertification : Arid and Semi-arid Ecosystem
How many pairs given above are correctly matched?
Explanation: Pair 1 is incorrectly matched. Ocean acidification is a threat to marine and coastal ecosystems due to the absorption of atmospheric CO2 by seawater. Peninsular river ecosystems are freshwater systems and are not directly impacted by ocean acidification. Pair 2 is correctly matched. The Eastern Himalayan region is highly vulnerable to Glacial Lake Outburst Floods (GLOFs). Climate change is causing rapid glacial melting, leading to the formation and expansion of unstable glacial lakes, which significantly increases the risk of GLOFs in this ecosystem. Pair 3 is correctly matched. Desertification is the process of land degradation in arid, semi-arid, and dry sub-humid areas, leading to the expansion of desert-like conditions, as defined by the UNCCD.
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Current AffairsMedium
Q85.With reference to climate change and biodiversity loss, consider the following statements:
1. According to the IUCN, approximately one-fifth of the world's most vulnerable natural areas may face catastrophic species loss.
2. The inability of many species to migrate to new suitable habitats at a pace matching climate-induced changes is a primary driver of extinction risk.
3. Mangrove ecosystems act as natural barriers against coastal flooding and function as significant carbon sinks.
Which of the statements given above is/are correct?
Explanation: Statement 1 is incorrect. This finding, regarding one-fifth of the world's most vulnerable natural areas facing catastrophic species loss, was published in a report by the World Wildlife Fund (WWF), not the International Union for Conservation of Nature (IUCN). The statement incorrectly attributes the finding to the IUCN. Statement 2 is correct. Climate change alters habitats faster than many species can adapt or move, trapping them in unsuitable conditions and increasing their risk of extinction. Statement 3 is correct. Mangroves provide critical ecosystem services, including coastal protection from storm surges and sea-level rise, and sequestering large amounts of carbon in their biomass and soil.
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Current AffairsMedium
Q86.Consider the following statements regarding Glacial Lake Outburst Floods (GLOFs) in the Himalayan region:
1. GLOFs are characterized by a sudden and severe release of water from a moraine-dammed lake.
2. The Western Himalayas are considered more vulnerable to GLOF events compared to the Eastern Himalayas due to higher seismic activity.
3. An increase in the rate of glacial melting due to climate change directly contributes to the formation and expansion of glacial lakes.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. GLOFs are indeed catastrophic floods resulting from the failure of a dam, typically a moraine or ice dam, containing a glacial lake. Statement 2 is incorrect. The Eastern and Central Himalayas are generally considered more vulnerable to GLOF events. This is attributed to factors like steeper terrain and climatic conditions that favor the formation of numerous glacial lakes. Statement 3 is correct. As glaciers retreat rapidly due to rising temperatures, they leave behind depressions that fill with meltwater, forming new glacial lakes or expanding existing ones, thereby increasing the overall GLOF risk.
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Current AffairsHard
Q87.With reference to the institutional framework for managing Glacial Lake Outburst Flood (GLOF) risks in India, consider the following statements:
1. The National Disaster Management Authority (NDMA) is the sole agency responsible for issuing GLOF early warnings across the Himalayan states.
2. The Geological Survey of India (GSI) is primarily tasked with the inventory and monitoring of glacial lakes and water bodies in the Himalayan region.
3. The Central Water Commission (CWC) is responsible for structural measures like dam construction and river channel management downstream of potential GLOF paths.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. While the NDMA is the apex body for disaster management and has issued guidelines on GLOFs, it is not the sole agency for issuing warnings. Early warning is a multi-agency effort involving the Indian Meteorological Department (IMD), Central Water Commission (CWC), and others. Statement 2 is correct. The GSI has a mandate to conduct surveys and studies in glaciology, which includes the inventory and monitoring of glacial lakes as part of landslide and natural hazard studies. Statement 3 is correct. The CWC's responsibilities include the planning, development, and management of water resources, which encompasses structural measures for flood control and management in river basins, including those affected by GLOFs. Therefore, only two statements are correct.
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Current AffairsHard
Q88.Consider the following statements:
Statement-I: The accelerated melting of Himalayan glaciers poses a long-term threat to the agricultural productivity and water security of the Indo-Gangetic plains.
Statement-II: The perennial rivers of the Indo-Gangetic plains are primarily monsoon-fed and their flow is largely independent of glacial meltwater contributions.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. The Himalayan glaciers act as a 'water tower', regulating the flow of major rivers like the Ganga, Indus, and Brahmaputra. Accelerated melting initially increases river flow but will eventually lead to reduced flow as glaciers shrink, threatening water availability for irrigation, which is the backbone of agriculture in the Indo-Gangetic plains. Statement-II is incorrect. This is a classic process inversion. While the monsoon is a critical source of water, the perennial nature of these rivers is significantly sustained by glacial melt, especially during the lean, pre-monsoon summer months. The flow is not independent of glacial melt; in fact, it is critically dependent on it for year-round water security.
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Current AffairsHard
Q89.Consider the following statements regarding climate-induced disasters in the Himalayan region:
Statement-I: The frequency of Glacial Lake Outburst Floods (GLOFs) is projected to increase in the eastern and central Himalayas.
Statement-II: This increase is primarily driven by the rapid accumulation of seasonal snowpack, which enhances the structural integrity of moraine dams holding back glacial lakes.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Climate change is accelerating glacial melt in the Himalayas, leading to the formation and expansion of glacial lakes, thereby increasing the risk of GLOFs. Statement-II is incorrect. The process described is inverted. The increase in GLOF risk is due to rising temperatures causing rapid glacial melt, which destabilizes the moraine dams through increased water pressure and melting of ice cores within the moraine. Heavy snowpack accumulation is a separate phenomenon and does not enhance dam integrity in the context of warming-induced GLOFs.
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Current AffairsHard
Q90.With reference to the ecological characteristics and disaster management framework of the Indian Himalayan Region, consider the following statements:
1. The Himalayan mountain ranges are recognized globally as a 'biodiversity hotspot' due to their high species richness and endemism.
2. The National Disaster Management Authority (NDMA) is the primary nodal agency for generating and issuing scientific forecasts for GLOF risks and glacial melt rates.
3. Mangrove forests, typically found in coastal areas, can be effectively cultivated at high altitudes in the Himalayas to act as natural barriers against landslides.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. The Himalayas are one of the world's recognized biodiversity hotspots, hosting a vast array of unique flora and fauna. Statement 2 is incorrect. The NDMA is the apex body for disaster management planning and response, but it is not the primary agency for generating scientific forecasts. This role is fulfilled by scientific bodies like the Central Water Commission (CWC), Indian Space Research Organisation (ISRO), and other research institutions that provide data which NDMA then uses for policy and planning. Statement 3 is incorrect. Mangroves are halophytes, meaning they are salt-tolerant plants adapted to coastal saline or brackish water environments. They cannot survive in the alpine conditions of the high-altitude Himalayas.
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Current AffairsMedium
Q91.With reference to the impacts of climate change on India's diverse ecosystems, consider the following statements:
1. Ocean acidification negatively impacts shell-forming organisms by reducing the concentration of available carbonate ions.
2. The melting of Himalayan glaciers, while posing flood risks, is also a key factor contributing to the perennial flow of major North Indian rivers.
3. The phenomenon of desertification exclusively leads to increased aridity and a reduction in all forms of precipitation in the affected regions.
Which of the statements given above are correct?
Explanation: Statement 1 is correct. As the ocean absorbs more CO2, it forms carbonic acid, which lowers the pH and consumes carbonate ions, making it harder for organisms like corals and mollusks to build their shells and skeletons. Statement 2 is correct. Himalayan glaciers act as a massive freshwater reserve. Their seasonal and long-term meltwater is the primary source for many perennial rivers like the Ganga, Indus, and Brahmaputra, which are lifelines for the Indo-Gangetic plains. Statement 3 is incorrect. While desertification involves the expansion of drylands, climate change can also alter weather patterns to cause extreme and anomalous events. This can include short, intense bursts of rainfall leading to flash floods in desert areas, as has been observed. Therefore, it does not exclusively lead to a reduction in all precipitation.
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Current AffairsHard
Q92.Consider the following statements:
Statement-I: The frequency, duration, and intensity of Marine Heatwaves have shown a significant increasing trend in recent decades across global oceans.
Statement-II: The primary driver for these events is the absorption of excess atmospheric heat by the ocean's surface layer, compounded by atmospheric conditions that suppress vertical mixing.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is a well-documented fact based on oceanic and climate data; marine heatwaves are becoming more common and severe due to climate change. Statement-II correctly identifies the core physical mechanism: the ocean absorbs over 90% of the excess heat from global warming. This heat is trapped in the surface layer, especially when local weather patterns (like high-pressure systems) reduce wind and ocean mixing, leading to a rapid temperature spike. Thus, Statement-II provides the direct scientific explanation for the trend mentioned in Statement-I.
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Current AffairsHard
Q93.With reference to the ecological impacts of Marine Heatwaves (MHWs), consider the following statements:
1. They are a primary trigger for mass coral bleaching events by causing the expulsion of symbiotic algae.
2. They often lead to the collapse of kelp forests, which are foundational species in cooler marine environments.
3. They are a direct cause of ocean acidification by increasing the rate of carbonic acid formation.
How many of the statements given above are correct?
Explanation: Statement 1 is correct; elevated temperatures from MHWs stress corals, causing them to expel the zooxanthellae that provide them with food and color. Statement 2 is correct; kelp are cool-water species and cannot survive the prolonged high temperatures during an MHW, leading to widespread die-offs. Statement 3 is incorrect. Ocean acidification is a chemical process driven by the long-term absorption of atmospheric CO2, forming carbonic acid. MHWs are a thermal (heat) phenomenon. While both are consequences of climate change, an MHW does not directly cause acidification.
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Current AffairsMedium
Q94.Consider the following statements regarding Marine Heatwaves (MHWs) in the context of India:
1. The coral ecosystems of Lakshadweep and the Andaman & Nicobar Islands are particularly susceptible to MHW-induced mass bleaching.
2. The Indian National Centre for Ocean Information Services (INCOIS) is the nodal agency for operational monitoring and forecasting of MHWs.
3. Pre-monsoon MHWs in the Bay of Bengal can significantly modulate the intensity and progression of the Indian Summer Monsoon.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct; India's primary coral reef areas in these islands are highly vulnerable to rising sea temperatures. Statement 2 is correct; INCOIS, under the Ministry of Earth Sciences, has the mandate to provide ocean information and advisories, including early warnings for marine heatwaves. Statement 3 is correct; the ocean and atmosphere are coupled. Anomalously high sea surface temperatures in the Bay of Bengal before the monsoon can affect atmospheric pressure and moisture availability, thereby influencing monsoon dynamics.
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Current AffairsHard
Q95.With reference to the management of Glacial Lake Outburst Floods (GLOFs) in India, consider the following statements:
1. The National Disaster Management Authority (NDMA) is the sole agency responsible for both forecasting and implementing structural mitigation measures for GLOFs.
2. The Central Water Commission (CWC) is primarily tasked with identifying and monitoring potentially dangerous glacial lakes using remote sensing technologies.
3. The India Meteorological Department (IMD) provides specific site-level forecasts for glacial lake stability and outburst probability.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The NDMA is the nodal agency for disaster management and issues guidelines, but it is not the sole agency for forecasting or implementation. Multiple agencies are involved. Statement 2 is incorrect. While the CWC monitors water levels in rivers, the primary role of identifying and monitoring glacial lakes often involves agencies like the Geological Survey of India (GSI) and the National Remote Sensing Centre (NRSC). Statement 3 is incorrect. The IMD provides general weather and rainfall forecasts for a region, which can be triggers for GLOFs, but it does not provide specific forecasts for the stability of a particular glacial lake. Therefore, none of the statements are correct.
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Current AffairsMedium
Q96.Consider the following statements regarding Glacial Lake Outburst Floods (GLOFs):
1. They are typically triggered by the failure of a moraine or ice dam that impounds a glacial lake.
2. The risk of GLOFs is primarily concentrated in the Western Himalayas due to higher rates of glacial accumulation.
3. An earthquake or heavy rainfall can act as a catalyst for the breach of an unstable moraine dam.
Which of the statements given above are correct?
Explanation: Statement 1 is correct. GLOFs are sudden releases of a significant amount of water from a glacial lake, which is held back by a dam made of moraine (glacial debris) or ice. The failure of this dam leads to the outburst. Statement 2 is incorrect. The risk of GLOFs is significant across the Himalayas, but recent studies and events indicate a particularly increasing threat in the Eastern and Central Himalayas due to rapid glacial retreat and lake formation, not higher accumulation. The premise of concentration in the Western Himalayas is a common misconception. Statement 3 is correct. The dams holding glacial lakes are often unstable. External triggers like seismic activity (earthquakes), heavy rainfall leading to overflow, or avalanches falling into the lake can cause the dam to fail, leading to a GLOF.
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Current AffairsMedium
Q97.Consider the following statements:
Statement-I: The formation of new glacial lakes and the expansion of existing ones in high-mountain regions have been observed at an accelerated rate.
Statement-II: Anthropogenic climate change is causing rapid retreat and thinning of glaciers, creating depressions that get filled with meltwater.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is a well-documented phenomenon observed globally, particularly in the Himalayas. The number and size of glacial lakes are increasing. Statement-II provides the underlying scientific reason for this phenomenon. Global warming, driven by human activities, leads to higher temperatures, which cause glaciers to melt and retreat. As they retreat, they leave behind depressions in the landscape which are then filled by the meltwater, forming glacial lakes. Thus, Statement-II is the direct and correct explanation for the observation described in Statement-I.
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Current AffairsHard
Q98.With reference to high-altitude multilateral dialogues concerning mountain ecosystems, consider the following statements:
1. Such forums are typically initiated by a host nation to address shared environmental and developmental challenges.
2. A primary objective of these dialogues is to establish legally binding frameworks for transboundary resource management.
3. The scope of discussions is often limited to disaster risk reduction, particularly glacial lake outburst floods.
How many of the statements given above are correct?
Explanation: Statement 1 is correct: High-level forums like the Sagarmatha Sambaad are initiated by a host country (Nepal in this case) to foster cooperation on issues pertinent to a specific region, such as the Himalayas. Statement 2 is incorrect: These dialogues are platforms for discussion and consensus-building, not for creating legally binding treaties. Their outcomes are generally voluntary commitments or joint declarations. This is a common trap confusing voluntary platforms with binding conventions. Statement 3 is incorrect: The scope is broad, encompassing climate change, biodiversity, sustainable tourism, and livelihoods, not just a single issue like GLOFs. The word 'limited' is a key qualifier.
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Current AffairsHard
Q99.Consider the following statements regarding the biodiversity of the Himalayan ecosystem:
1. The Snow Leopard, a flagship species of the high Himalayas, is found exclusively within the political boundaries of India and Nepal.
2. Habitat fragmentation due to infrastructure development and climate change is a primary threat to the connectivity of wildlife populations in the region.
3. The establishment of transboundary conservation areas is a recognized strategy to facilitate the movement of wide-ranging species across national borders.
Which of the statements given above are correct?
Explanation: Statement 1 is incorrect: This is an example of an 'Endemism Swap' trap. The Snow Leopard has a vast range spanning 12 countries in Central and South Asia, including China, Bhutan, Pakistan, and Russia, not just India and Nepal. Statement 2 is correct: Linear infrastructure (roads, railways) and changing climatic conditions break up large habitats into smaller, isolated patches, which restricts gene flow and threatens the viability of animal populations. Statement 3 is correct: Transboundary conservation landscapes, such as the one involving Manas National Park (India) and Royal Manas National Park (Bhutan), are crucial for protecting species like tigers and elephants that have large home ranges extending beyond one country.
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Current AffairsHard
Q100.Consider the following pairs regarding phenomena associated with the Himalayan cryosphere:
1. Black Carbon : Increases glacial albedo
2. Glacial Lake Outburst Flood : Moraine dam failure
3. Himalayan Perennial Rivers : Primarily monsoon-fed
How many pairs given above are correctly matched?
Explanation: Pair 1 is incorrectly matched: This is a 'Process Inversion'. Black carbon (soot) deposits on glaciers decrease, not increase, their albedo (reflectivity). This darkening effect causes the glacier to absorb more solar radiation, accelerating melting. Pair 2 is correctly matched: GLOFs often occur when the natural dam of a glacial lake, typically composed of moraine (rock, soil, and ice), fails catastrophically due to pressure from the growing lake or external triggers. Pair 3 is incorrectly matched: The major perennial rivers originating in the high Himalayas (like the Indus, Ganga, and Brahmaputra) are primarily glacier-fed and snow-fed, which ensures their year-round flow. While monsoons contribute significantly to their volume, their perennial nature is due to the glaciers. Peninsular rivers are primarily monsoon-fed.
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Current AffairsHard
Q101.Consider the following statements regarding the Himalayan ecosystem:
1. The ecosystem's glacial meltwaters are a primary source for perennial rivers vital to the Indo-Gangetic plains.
2. An increase in Glacial Lake Outburst Floods (GLOFs) is a predicted consequence of climate change, primarily in the Western Himalayas.
3. The ecosystem's transboundary rivers provide critical water resources to India, China, Pakistan, and Nepal.
How many of the statements given above are correct?
Explanation: Statement 1 is correct as Himalayan glaciers feed major perennial rivers like the Ganges and Brahmaputra. Statement 3 is correct as the Himalayan river systems are transboundary, supporting multiple nations. Statement 2 is incorrect; while GLOFs are a rising threat, scientific studies and reports predict a higher risk in the eastern and central Himalayas, not primarily the western region.
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Current AffairsMedium
Q102.Statement-I: Increased atmospheric carbon dioxide concentration poses a significant threat to marine shell-forming organisms and coral reefs.
Statement-II: The dissolution of excess carbon dioxide in ocean water leads to a decrease in pH, which hinders the process of calcification used by these organisms.
Explanation: Statement-I correctly identifies a major environmental threat. Statement-II accurately describes the underlying chemical mechanism: increased dissolved CO2 forms carbonic acid, lowering the ocean's pH (ocean acidification). This reduces the availability of carbonate ions, which are essential building blocks for shells and skeletons, thus hindering calcification. Therefore, Statement-II is the correct scientific explanation for Statement-I.
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Current AffairsHard
Q103.Consider the following pairs:
Phenomenon : Primary Mechanism/Description
1. Glacial Lake Outburst Floods : Catastrophic downstream flooding from moraine-dammed lakes.
2. Ocean Acidification : Expulsion of symbiotic algae from coral tissues due to thermal stress.
3. Desertification : Land degradation in arid and semi-arid regions leading to loss of biological productivity.
How many pairs given above are correctly matched?
Explanation: Pair 1 is correctly matched; GLOFs are sudden releases of water from lakes dammed by glacial moraines. Pair 3 is correctly matched; this is the standard definition of desertification. Pair 2 is incorrectly matched; the description provided is for 'coral bleaching', which is primarily caused by thermal stress. Ocean acidification is the decrease in ocean pH due to CO2 uptake, which hinders shell and skeleton formation.
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Current AffairsHard
Q104.Consider the following statements:
Statement-I: The Himalayan region is witnessing an accelerated rate of glacial melt and an increase in the number and size of glacial lakes.
Statement-II: The deposition of atmospheric black carbon and dust on glaciers enhances their surface albedo, leading to increased reflection of solar radiation.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Scientific reports and observations confirm that climate change is causing glaciers in the Himalayas to retreat at an accelerated pace, resulting in the formation and expansion of glacial lakes. Statement-II is incorrect. The deposition of black carbon and dust (aerosols) on glacial surfaces decreases, not enhances, the albedo. A lower albedo means less solar radiation is reflected and more is absorbed, which in turn accelerates the melting of ice and snow. Therefore, the process described in Statement-II is inverted.
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Current AffairsHard
Q105.Consider the following statements regarding Glacial Lake Outburst Floods (GLOFs) and their management in the Himalayan context:
1. GLOFs are low-frequency, high-magnitude hydrogeological hazards primarily caused by the failure of moraine or ice dams.
2. The National Mission on Sustaining the Himalayan Ecosystem (NMSHE) is exclusively focused on biodiversity conservation and afforestation, excluding cryospheric studies.
3. The destructive impact of a GLOF is generally confined to the upper reaches of the mountain valley, with minimal risk to downstream infrastructure and populations.
How many of the above statements are correct?
Explanation: Statement 1 is correct. GLOFs are indeed catastrophic events characterized by the sudden release of a large volume of water from a glacial lake, typically dammed by unstable moraines or ice. Statement 2 is incorrect. The NMSHE, under the National Action Plan on Climate Change (NAPCC), has a broad mandate that explicitly includes monitoring the health of the cryosphere (glaciers, snow) and strengthening disaster risk reduction mechanisms. Statement 3 is incorrect. GLOFs can travel long distances downstream, carrying massive amounts of water, sediment, and debris, causing widespread destruction to infrastructure, farms, and human settlements far from the source.
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Current AffairsMedium
Q106.With reference to the monitoring and mitigation of risks associated with glacial lakes in India, consider the following statements:
1. The National Disaster Management Authority (NDMA) has issued detailed guidelines for reducing risks from GLOFs, including the identification of vulnerable lakes.
2. The Central Water Commission (CWC) is the sole nodal agency for the operational forecasting and early warning of all flood types, including GLOFs.
3. Structural measures for GLOF risk mitigation can include siphoning water from the lake and creating controlled breach channels.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. The NDMA has published comprehensive guidelines on the management of GLOFs, which cover aspects like risk assessment, monitoring, early warning systems, and capacity building. Statement 2 is incorrect. While the CWC plays a crucial role in flood forecasting, it is not the 'sole' agency. GLOF warning is a multi-institutional effort involving the IMD, ISRO, GSI, and state disaster management authorities, coordinated under the NDMA framework. The use of the extreme word 'sole' makes the statement incorrect. Statement 3 is correct. Engineering interventions, such as controlled drainage through siphoning or constructing an artificial spillway, are recognized structural methods to lower the lake level and reduce the hydrostatic pressure on the dam, thereby mitigating the risk of an outburst.
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Current AffairsHard
Q107.Consider the following statements regarding the impact of rapid sea-level rise on coral reef ecosystems:
Statement-I: Rapid and significant sea-level rise can lead to the 'drowning' of coral reefs, even in the absence of thermal bleaching events.
Statement-II: The symbiotic zooxanthellae within corals are photosynthetic organisms requiring access to sunlight, which is diminished as water depth increases.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Coral reefs have a specific range of depth in which they can grow. If sea level rises too quickly, the corals may not be able to grow upwards fast enough to maintain their position within the photic (sunlight) zone, leading to their 'drowning'. Statement-II is also correct. Corals have a symbiotic relationship with algae called zooxanthellae, which live in their tissues and photosynthesize, providing the coral with most of its food. Photosynthesis requires sunlight. Statement-II provides the precise biological mechanism for the phenomenon described in Statement-I, making it the correct explanation.
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Current AffairsHard
Q108.With reference to the causes and consequences of sea-level rise, consider the following statements:
1. The Intergovernmental Panel on Climate Change (IPCC) predicts that accelerated ice sheet disintegration could lead to rapid sea-level rise.
2. Rising sea levels can lead to increased salinity in coastal aquifers, diminishing freshwater supplies for coastal communities.
3. Healthy coral reef structures help in dissipating wave energy, thereby offering natural protection to coastlines from storm surges and erosion.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. The Intergovernmental Panel on Climate Change (IPCC) assessment reports are the most authoritative scientific consensus on climate change. These reports consistently identify the melting of glaciers and the disintegration of the Greenland and Antarctic ice sheets as primary drivers of sea-level rise. Accelerated disintegration poses a risk of non-linear, rapid increases in global mean sea level. Statement 2 is correct. As sea levels rise, the hydraulic pressure of seawater on coastal groundwater systems increases. This leads to a phenomenon known as saltwater intrusion, where saline water pushes inland and contaminates freshwater aquifers, making the water unsuitable for drinking and agriculture. Statement 3 is correct. Coral reefs act as natural submerged breakwaters. Their complex structures are highly effective at dissipating wave energy, reducing wave height and power before they reach the coastline. This natural defense mechanism significantly mitigates coastal erosion and reduces the destructive impact of storm surges. Therefore, all three statements are correct.
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Current AffairsMedium
Q109.Consider the following statements:
Statement-I: Recent trends indicate a potential increase in the intensity of tropical storms and cyclones in regions like the Bay of Bengal.
Statement-II: Warmer sea surface temperatures provide the necessary heat energy and moisture that act as the primary fuel for the formation and intensification of cyclonic systems.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. There is a strong scientific consensus, supported by reports from bodies like the Intergovernmental Panel on Climate Change (IPCC), that global warming is leading to an increase in the intensity of tropical cyclones. Regions like the Bay of Bengal are experiencing this trend. Statement-II is also correct. It accurately describes the fundamental mechanism of cyclone formation and intensification. Tropical cyclones are heat engines that draw energy from warm ocean waters. Higher sea surface temperatures provide more heat and moisture, which are converted into the kinetic energy of the storm, resulting in stronger winds and heavier rain. Because the increased availability of heat and moisture from warmer seas (Statement-II) is the direct cause for the observed increase in storm intensity (Statement-I), Statement-II is the correct explanation for Statement-I.
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Current AffairsHard
Q110.With reference to the impacts of sea-level rise on coastal ecosystems and human settlements in India, consider the following statements:
1. Coral reef ecosystems are highly resilient to changes in sea salinity and temperature, allowing them to adapt easily to coastal inundation.
2. The economic and geographical impacts of sea-level rise are projected to be uniformly distributed across all Indian coastal states.
3. Coastal inundation can lead to saltwater intrusion, diminishing the availability of freshwater in coastal aquifers.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. Coral reef ecosystems are extremely sensitive to environmental changes. Rising sea temperatures cause thermal stress, leading to coral bleaching. Changes in sea salinity and ocean acidification further threaten their survival. They are considered highly vulnerable, not resilient, to the impacts of climate change and sea-level rise.
Statement 2 is incorrect. The impacts of sea-level rise are highly differential, not uniform. Vulnerability varies significantly based on factors like coastal geomorphology (e.g., low-lying deltas vs. steep cliffs), local land subsidence rates, population density, and the concentration of economic assets. For instance, low-lying and densely populated delta regions like the Sundarbans are far more vulnerable than other coastal areas.
Statement 3 is correct. As sea levels rise, the increased hydrostatic pressure from the sea pushes saltwater further inland into coastal groundwater systems. This phenomenon, known as saltwater intrusion, contaminates freshwater aquifers, reducing the availability of potable water and water for agriculture in coastal regions.
Therefore, only one of the statements is correct.
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Current AffairsHard
Q111.Consider the following statements regarding mangrove ecosystems in the context of increasing cyclonic threats:
1. Mangrove forests serve as effective natural barriers that dissipate the energy of storm surges, thereby protecting coastal communities.
2. The specialized root systems of mangroves, such as pneumatophores, are adapted for permanent and deep inundation from rapid sea-level rise.
3. In India, natural mangrove forests are found exclusively along the coasts of West Bengal and Odisha.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. This is a well-established ecological function of mangrove ecosystems. Their dense root networks and trunks reduce the velocity and height of storm surges. Statement 2 is incorrect. Pneumatophores are breathing roots adapted to anaerobic (low-oxygen) soil in intertidal zones. Prolonged, permanent inundation would suffocate these roots and kill the trees, making them vulnerable to, not adapted for, rapid sea-level rise. Statement 3 is incorrect. This is an example of an 'Endemism Swap' trap. While West Bengal (Sundarbans) and Odisha have significant mangrove cover, they are not exclusive. Mangroves are also found along the coasts of Gujarat (second largest area), Andhra Pradesh, Tamil Nadu, Maharashtra, and Goa.
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Current AffairsHard
Q112.Statement I: The frequent inundation of coastal areas by seawater can lead to the large-scale die-off of terrestrial trees, creating 'ghost forests'.
Statement II: High soil salinity disrupts the osmotic potential, impairing the ability of non-adapted plants to absorb water through their roots, leading to physiological drought.
Explanation: Statement-I correctly describes the phenomenon of 'ghost forests' resulting from saltwater intrusion. Statement-II accurately provides the underlying biological mechanism. Plants that are not adapted to saline conditions (glycophytes) cannot overcome the high salt concentration in the soil, which prevents water uptake due to an unfavorable osmotic gradient, effectively causing them to die of thirst despite being in a flooded environment. Thus, Statement-II is the direct scientific explanation for Statement-I.
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Current AffairsHard
Q113.With reference to the ecological impacts of rising sea levels on coastal vegetation, consider the following statements:
1. Mangrove species possess specialized root structures like pneumatophores that help them survive in oxygen-poor, waterlogged soils.
2. The formation of 'ghost forests' is characterized by the death of salt-intolerant tree species due to saltwater intrusion.
3. The decay of dead trees in newly formed ghost forests results in a significant, long-term sequestration of carbon in coastal soils.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. Pneumatophores are aerial roots that allow mangroves to perform gaseous exchange in anaerobic mud. Statement 2 is correct. 'Ghost forests' are areas where saltwater has killed salt-intolerant (terrestrial) trees. Statement 3 is incorrect. The decay of large numbers of dead trees releases significant amounts of carbon (CO2 and methane) into the atmosphere, acting as a source, not a long-term sink. This is a process inversion; while some carbon enters the soil, the net effect is a large, short-term release. Therefore, only two statements are correct.
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Current AffairsMedium
Q114.Consider the following consequences of increased coastal flooding and saltwater intrusion:
1. A landward migration of salt-tolerant ecosystems like salt marshes.
2. A decrease in freshwater availability in coastal aquifers.
3. An increase in soil stability and sediment accretion along the immediate coastline.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. As sea levels rise, salt-tolerant ecosystems like mangroves and salt marshes tend to migrate inland into areas previously occupied by freshwater vegetation. Statement 2 is correct. Saltwater intrusion is a well-documented phenomenon where seawater percolates into coastal aquifers, contaminating freshwater sources and reducing their availability for human and agricultural use. Statement 3 is incorrect. The death of coastal forests and vegetation due to saltwater intrusion leads to the loss of root systems that bind and stabilize soil, thereby increasing coastal erosion, not stability.
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Current AffairsMedium
Q115.With reference to the mechanisms of carbon markets, consider the following statements:
1. A single carbon credit represents a tradeable permit for emitting one tonne of carbon dioxide or its equivalent.
2. Historically, developing countries have been major sellers of carbon credits, while developed nations have been the primary buyers.
3. Carbon credits are exclusively traded through inter-governmental agreements under United Nations frameworks and are not listed on private commodity exchanges.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. A carbon credit is a generic term for any tradable certificate or permit representing the right to emit one tonne of carbon dioxide equivalent (tCO2e). Statement 2 is correct. Under mechanisms like the Clean Development Mechanism (CDM) of the Kyoto Protocol, developing countries like India and China hosted emission-reduction projects and sold credits to developed countries to help them meet their emission targets. Statement 3 is incorrect. Carbon credits are traded on various platforms, including commodity exchanges. For instance, India's Multi Commodity Exchange (MCX) was one of the first in Asia to facilitate the trading of carbon credits, demonstrating that they are not limited to government-to-government channels.
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Current AffairsHard
Q116.Consider the following statements regarding carbon offsetting:
Statement-I: A business can achieve carbon neutrality by financing projects in other locations, such as replacing kerosene lamps with solar panels in a rural community.
Statement-II: For an offset to be credible, it must prove 'additionality', which confirms that the financed emission reduction would have happened anyway, even without the external investment.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Carbon offsetting allows an entity to compensate for its emissions by financing an equivalent carbon dioxide saving elsewhere. The example of funding solar panels to replace carbon-intensive kerosene is a classic case of offsetting. Statement-II is incorrect. It inverts the definition of 'additionality'. A project is 'additional' only if the emission reductions would *not* have occurred in the absence of the revenue from the sale of carbon credits. The investment must be the decisive factor for the project to happen.
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Current AffairsHard
Q117.Consider the following pairs regarding the quality criteria for carbon offset projects:
1. Additionality : An emission reduction in one area causes an unintended increase in emissions elsewhere.
2. Leakage : The assurance that the benefits of an emission reduction project are not temporary or reversible.
3. Permanence : The principle that the emission reduction would not have occurred without the incentive from the offset market.
How many of the pairs given above are correctly matched?
Explanation: None of the pairs are correctly matched due to a swap in their definitions. Pair 1 is incorrect. The definition provided describes 'Leakage', not 'Additionality'. Additionality is the principle that the emission reduction would not have happened without the project. Pair 2 is incorrect. The definition provided describes 'Permanence', not 'Leakage'. Leakage is when an emission-reducing activity in one place causes an increase in emissions elsewhere. Pair 3 is incorrect. The definition provided describes 'Additionality', not 'Permanence'. Permanence is the assurance that the carbon stored or reduced will not be released back into the atmosphere for a long duration.
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Current AffairsHard
Q118.Consider the following criteria for evaluating the credibility of carbon offset projects:
1. Additionality: The emission reduction would have occurred even without the financial incentive from the carbon offset purchase.
2. Permanence: The project ensures that the emission reductions are long-lasting and not reversed at a later stage.
3. Leakage: The project does not inadvertently cause an increase in emissions in another location or sector.
How many of the above statements are correctly defined?
Explanation: Statement 1 is incorrect. It describes the opposite of additionality. Additionality means the emission reductions are 'additional' to what would have happened otherwise and would not have occurred without the revenue from the sale of carbon credits. Statement 2 is correct. Permanence ensures that the carbon removed from the atmosphere is kept stored for a specified, long period. Statement 3 is correct. Leakage refers to the potential for an emission-reduction project to cause an increase in emissions outside the project's boundary.
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Current AffairsHard
Q119.Consider the following statements:
Statement-I: A carbon credit is a tradeable permit allowing the holder to emit a specific quantity of greenhouse gases, typically one tonne of CO2 equivalent.
Statement-II: Carbon offsetting involves financing projects that reduce emissions elsewhere, thereby generating carbon credits that can be traded on commodity exchanges.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I provides the fundamental definition of a carbon credit as a financial instrument. Statement-II correctly describes carbon offsetting, which is one of the primary ways carbon credits are generated. However, Statement-II is not the complete or sole explanation for Statement-I. Carbon credits can also be generated within cap-and-trade systems when an entity emits less than its allocated allowance, which is different from funding a separate offset project. Therefore, both statements are correct, but one does not exclusively explain the other.
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Current AffairsMedium
Q120.With reference to carbon market mechanisms, consider the following statements:
1. Under mechanisms established by international climate agreements, a company in a developed country can invest in an emission-reduction project in a developing country to earn carbon credits.
2. A carbon credit is a financial instrument representing a reduction or removal of one tonne of carbon dioxide or its equivalent in other greenhouse gases.
3. In India, carbon credits are exclusively traded by government agencies and are not permitted on private commodity exchanges.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. This describes the principle behind mechanisms like the Clean Development Mechanism (CDM) of the Kyoto Protocol, allowing for cross-border investment in green projects. Statement 2 is correct. This is the standard definition of a carbon credit, representing one tonne of CO2e. Statement 3 is incorrect. Carbon credits have been traded on commodity exchanges in India, such as the Multi Commodity Exchange (MCX), which is not an exclusive government trading agency.
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Current AffairsHard
Q121.Consider the following statements regarding the quality criteria for a credible carbon offset project:
1. Additionality: This principle ensures that the emission reduction from the project would have occurred even without the financial incentive from the offset market.
2. Permanence: This refers to the long-term durability of the emission reduction, ensuring it is not reversed or temporary.
3. Leakage: This addresses the risk that an emission reduction activity in one area might cause an unintentional increase in emissions elsewhere.
How many of the above statements are correct?
Explanation: Statement 1 is incorrect. The principle of 'additionality' means the emission reduction would *not* have happened without the project or the carbon finance. The project must be 'additional' to the business-as-usual scenario. Statement 2 is correct; permanence is crucial to ensure that the climate benefit is real and lasting. Statement 3 is correct; leakage is a critical factor to account for potential negative side-effects of a project, ensuring a net global reduction in emissions.
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Current AffairsMedium
Q122.With reference to the mechanisms of carbon credits, consider the following statements:
1. A carbon credit is a tradeable certificate representing the right to emit a specified quantity of carbon dioxide or its equivalent.
2. A company in a developed country can invest in an emission reduction project in a developing country and use the earned credits to help meet its emission targets.
3. India's Multi Commodity Exchange (MCX) was the first exchange in the world to facilitate the trading of carbon credits.
Which of the statements given above are correct?
Explanation: Statement 1 is correct; it is the standard definition of a carbon credit, typically representing one tonne of CO2e. Statement 2 is correct; this describes the fundamental principle of offsetting mechanisms like the Clean Development Mechanism (CDM) under the Kyoto Protocol. Statement 3 is incorrect; while MCX was a pioneer, it was the first in Asia, not the world. European exchanges were trading carbon credits earlier.
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Current AffairsHard
Q123.Consider the following statements:
Statement-I: Carbon offsetting allows a business to compensate for its own emissions by financing projects, such as renewable energy installations in other locations, that reduce greenhouse gas emissions.
Statement-II: The primary legal basis for all international carbon offsetting projects is the Environment (Protection) Act, 1986, which mandates Indian entities to purchase such offsets.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I correctly and accurately describes the concept of carbon offsetting. Statement-II is incorrect. The legal and procedural basis for international carbon offsetting stems from international frameworks like the UNFCCC's Kyoto Protocol and Paris Agreement, as well as various voluntary carbon standards. The Environment (Protection) Act, 1986 is India's domestic environmental legislation and does not serve as the primary legal basis mandating the purchase of international offsets in this manner.
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Current AffairsHard
Q124.With reference to market-based mechanisms for environmental conservation, consider the following statements:
1. A carbon credit is earned when an entity's emissions are one tonne less than the prescribed standard.
2. For a carbon offset to be credible, it must be 'additional', meaning the emission reduction would have occurred even without the project financing.
3. 'Leakage' in a carbon project refers to the emission reduction in one area causing an increase in emissions elsewhere.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. A carbon credit is a reward for reducing emissions below a certain benchmark. An entity that emits one tonne less than the standard earns one credit. Statement 2 is incorrect. This is a process inversion. 'Additionality' is a core principle which means the reduction in emissions would *not* have happened without the additional income from the sale of carbon offsets. Statement 3 is correct. Leakage is a negative side-effect where the positive impact of a project is undermined by an increase in emissions in another location as a direct or indirect result of the project.
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Current AffairsMedium
Q125.Consider the following statements regarding the global carbon market:
Statement-I: Developing countries have often been major sellers of carbon credits, while developed countries have been major buyers.
Statement-II: The cost of implementing emission reduction technologies and projects is typically uniform across both developed and developing economies.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. Historically, under mechanisms like the Clean Development Mechanism (CDM) of the Kyoto Protocol, developing nations like China and India hosted emission-reduction projects and sold the resulting credits to entities in developed nations. Statement-II is incorrect. The economic principle behind this trade is that the marginal abatement cost (the cost of reducing one more unit of pollution) is often significantly lower in developing countries. This cost difference creates the economic incentive for the market. Therefore, Statement-II is factually incorrect and cannot be the explanation for Statement-I.
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Current AffairsMedium
Q126.Regarding the framework for carbon trading, consider the following statements:
1. The Kyoto Protocol under the UNFCCC framework allows companies to meet emission targets by investing in eco-friendly technology in other nations.
2. In India, carbon credits are recognized as a tradable commodity on exchanges like the Multi Commodity Exchange (MCX).
3. The World Bank is the sole authority responsible for verifying that carbon offsets are not double-counted in the global market.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. The Kyoto Protocol established flexible mechanisms, including the Clean Development Mechanism (CDM). The CDM allows entities in developed countries to fund emission reduction projects in developing countries and receive Certified Emission Reductions (CERs), which can be used to meet their own emission targets. Statement 2 is correct. In India, carbon credits have been treated as a tradable commodity. The Multi Commodity Exchange (MCX) launched futures trading in carbon credits in 2008, becoming the first exchange in Asia to do so and establishing a formal market for these instruments. Statement 3 is incorrect. There is no single global authority for verifying carbon offsets. The responsibility for preventing double-counting is distributed across various entities, including international registries under the UNFCCC, independent standards bodies like Verra and the Gold Standard, and national authorities within domestic carbon market systems. Attributing this sole responsibility to the World Bank is a factual error.
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Current AffairsMedium
Q127.Consider the following statements regarding the market mechanisms for carbon credits:
1. Historically, developed countries have been the primary buyers of carbon credits, while certain developing nations have been the primary sellers.
2. In India, carbon credits are regulated and traded as a commodity primarily under the oversight of the Securities and Exchange Board of India (SEBI).
3. A single carbon credit represents a tradable permit to emit one tonne of carbon dioxide or its equivalent in other greenhouse gases.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. The carbon market structure has historically involved developed nations (e.g., in Europe) buying credits to meet their emission targets, while developing countries with lower abatement costs (e.g., China, India) sell them. Statement 2 is incorrect. While carbon credits are traded as a commodity in India, it was the Multi Commodity Exchange (MCX), not SEBI, that pioneered this trading in Asia. SEBI regulates securities markets, not commodity derivatives markets exclusively. Statement 3 is correct. This is the standard definition of a carbon credit, representing the right to emit one metric tonne of CO2 equivalent (tCO2e).
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Current AffairsHard
Q128.Consider the following statements regarding carbon offsetting:
Statement-I: Carbon offsetting enables a business to fund an emission-reducing project, such as a renewable energy facility in another location, to compensate for its own unavoidable emissions.
Statement-II: The economic viability of such offsetting mechanisms relies on the principle that the marginal cost of greenhouse gas abatement is uniform across all geographical regions and industries.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. It accurately describes the fundamental concept of carbon offsetting, where an entity finances emission reductions elsewhere to compensate for its own. Statement-II is incorrect. The entire economic premise of carbon markets is the opposite; they thrive because the marginal cost of abatement is *not* uniform. It is often significantly cheaper to reduce emissions in developing countries than in developed ones. This cost differential creates the financial incentive for the offsetting market to exist.
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Current AffairsHard
Q129.For a carbon offset to be considered credible, it must meet several quality criteria. With reference to these criteria, consider the following statements:
1. The 'additionality' criterion ensures that the emission reduction would not have occurred in the absence of the revenue from the sale of offsets.
2. The 'leakage' criterion addresses the risk that an emission-reducing activity in one area could inadvertently shift emissions to another area.
3. The 'permanence' criterion requires that once a credit is sold, it is retired from the market to prevent it from being counted by another entity.
Which of the statements given above are correct?
Explanation: Statement 1 is correct. 'Additionality' is a core principle, meaning the project and its emission reductions are 'additional' to what would have happened anyway. Statement 2 is correct. 'Leakage' refers to the potential for a project to cause an unintended increase in emissions outside the project's boundary. For example, protecting one forest might lead to increased deforestation in a neighboring, unprotected forest. Statement 3 is incorrect. This statement confuses the concept of 'permanence' with 'retirement' or the prevention of 'double counting'. 'Permanence' refers to the longevity of the carbon sequestration or emission reduction (e.g., a forest must not be cut down after a few years). The act of ensuring a credit is not sold or used twice is known as 'retirement' and addresses the issue of 'double counting'.
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Current AffairsHard
Q130.Consider the following statements regarding the framework for a national carbon market in India:
1. The scheme is primarily administered by the Bureau of Energy Efficiency (BEE) under the direct aegis of the Ministry of Environment, Forest and Climate Change (MoEFCC).
2. It establishes a compliance market, making it mandatory for certain notified entities to meet specified greenhouse gas emission reduction targets.
3. The tradable instruments generated under this framework are designated as Carbon Credit Certificates.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. While the Bureau of Energy Efficiency (BEE) is the administrator, it functions under the Ministry of Power, not the MoEFCC. The MoEFCC provides the overall policy direction. Statement 2 is correct. The Indian Carbon Market is designed as a compliance mechanism, not a voluntary one, for designated entities. Statement 3 is correct. The instruments traded are officially known as Carbon Credit Certificates.
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Current AffairsHard
Q131.This question consists of two statements, Statement-I and Statement-II.
Statement-I: A 'Cap-and-Trade' system for carbon emissions provides certainty about the price of carbon but not the quantity of emission reductions.
Statement-II: In a 'Cap-and-Trade' system, the government sets a firm limit on total emissions, and market forces of supply and demand determine the price of emission allowances.
Explanation: Statement-I is incorrect. It inverts the core characteristics of the two main carbon pricing mechanisms. A 'Cap-and-Trade' system provides certainty about the quantity of emissions (the 'cap') while the price fluctuates. Conversely, a Carbon Tax provides price certainty but the resulting quantity of emission reductions can vary. Statement-II is correct. It accurately describes the mechanism of a cap-and-trade system where a quantitative limit (cap) is set, and trading among participants determines the market price.
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Current AffairsMedium
Q132.With reference to different types of carbon markets, consider the following statements:
1. Compliance carbon markets are established by governmental regulations that legally mandate certain entities to reduce their emissions.
2. Voluntary carbon markets operate outside of compliance schemes, allowing organizations and individuals to purchase carbon credits to offset their emissions for corporate social responsibility or other personal goals.
3. Carbon credits generated within a voluntary market are automatically fungible and can be used for compliance in any regulated national market.
Which of the statements given above are correct?
Explanation: Statement 1 is correct. Compliance markets, like the EU-ETS or India's ICCTS, are based on legal mandates. Statement 2 is correct. Voluntary markets cater to entities that are not legally obligated but wish to offset their carbon footprint. Statement 3 is incorrect. This is a common misconception. Credits from voluntary markets are generally not accepted in compliance markets unless a specific, formal linkage is established by the regulating authority. The standards, verification processes, and legal standing are different, preventing automatic fungibility.
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Current AffairsHard
Q133.Consider the following statements regarding international trade measures related to climate change, such as 'Border Carbon Adjustments':
1. These measures typically involve imposing a charge on imported goods equivalent to the carbon price they would have faced if produced under the domestic climate policy.
2. A primary objective of such measures is to prevent 'carbon leakage', where industries move to jurisdictions with less stringent environmental regulations.
3. International disputes arising from the imposition of such border taxes are primarily adjudicated by the Conference of the Parties (COP) to the UNFCCC.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. This is the basic definition of a Border Carbon Adjustment (BCA). Statement 2 is correct. Preventing carbon leakage and ensuring a level playing field for domestic industries are the main justifications for BCAs. Statement 3 is incorrect. The UNFCCC and its COP are forums for climate negotiations, not for adjudicating trade disputes. Disputes concerning tariffs and trade barriers fall under the purview of the World Trade Organization (WTO) and its Dispute Settlement Body.
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Current AffairsHard
Q134.Consider the following statements regarding the institutional framework for the carbon market in India:
1. The framework for the carbon credit trading scheme is established under the provisions of the Environment (Protection) Act, 1986.
2. The Bureau of Energy Efficiency (BEE) functions as the administrator of the Indian Carbon Market.
3. The Central Electricity Regulatory Commission (CERC) is tasked with regulating the trading of carbon credit certificates.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The framework for the Indian Carbon Market is established under the Energy Conservation Act, 2001, as amended by the Energy Conservation (Amendment) Act, 2022, not the Environment (Protection) Act, 1986. Statement 2 is correct. The Bureau of Energy Efficiency (BEE) is the designated administrator for the carbon market, responsible for its operational aspects. Statement 3 is correct. The Central Electricity Regulatory Commission (CERC) has been given the responsibility to regulate the trading activities of carbon credit certificates, ensuring market integrity.
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Current AffairsHard
Q135.With reference to carbon pricing mechanisms, consider the following statements:
1. A carbon tax provides greater certainty about the final cost of emissions for industries than a cap-and-trade system.
2. A cap-and-trade system provides greater certainty about the total quantity of emissions reduction to be achieved.
3. In a cap-and-trade system, the price of emission allowances is fixed by the government to prevent market volatility.
How many of the statements given above are correct?
Explanation: Statement 1 is correct. A carbon tax sets a fixed price per tonne of carbon, providing price predictability for businesses. Statement 2 is correct. A cap-and-trade system sets a firm limit (a 'cap') on total emissions, thus providing certainty on the environmental outcome (quantity of reduction). Statement 3 is incorrect. In a cap-and-trade system, the price of allowances is determined by market forces of supply and demand, which can lead to price volatility. The government sets the quantity (cap), not the price.
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Current AffairsMedium
Q136.Consider the following statements:
Statement-I: A carbon tax is often considered simpler to implement and less susceptible to manipulation by special interest groups compared to a cap-and-trade system.
Statement-II: A carbon tax establishes a uniform price on emissions across the economy, avoiding the need to create and regulate a complex market for tradable permits.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. A carbon tax is administratively simpler as it can often be integrated into existing fuel tax structures. Its transparency makes it less prone to lobbying for free allowances or other loopholes common in cap-and-trade systems. Statement-II is also correct. A carbon tax's core mechanism is setting a price, which is a direct fiscal tool. It does not require the creation of a new market, registries for permits, or complex rules for allowance allocation and trading. Statement-II provides the underlying reason for the simplicity and reduced manipulability mentioned in Statement-I, making it the correct explanation.
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Current AffairsMedium
Q137.With reference to international trade and climate policy, consider the following statements:
1. 'Border Carbon Adjustments' refer to tariffs imposed by importing countries on goods from nations with less stringent emission regulations.
2. India has officially proposed the use of such adjustments at the World Trade Organization to level the playing field.
3. The compatibility of Border Carbon Adjustments with WTO rules is a settled and non-contentious issue.
Which of the statements given above is/are correct?
Explanation: Statement 1 is correct. This is the standard definition of Border Carbon Adjustments (BCAs) or Carbon Border Adjustment Mechanisms (CBAMs), designed to prevent 'carbon leakage'. Statement 2 is incorrect. India has consistently opposed such unilateral measures, viewing them as protectionist and has indicated it would challenge them at the WTO. Statement 3 is incorrect. The compatibility of BCAs with WTO principles, such as the non-discrimination principle, is highly contentious and a subject of major international legal and trade disputes.
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Current AffairsHard
Q138.Consider the following statements regarding Luminescent Solar Concentrators (LSCs):
Statement-I: Luminescent Solar Concentrators (LSCs) are considered highly suitable for building-integrated photovoltaics (BIPV), particularly in regions with significant cloud cover.
Statement-II: LSCs operate by concentrating only direct solar radiation using mirrored surfaces, which necessitates continuous sun-tracking systems for optimal efficiency.
Which one of the following is correct in respect of the above statements?
Explanation: Statement-I is correct. LSCs can absorb both direct and diffuse sunlight, making them effective in cloudy climates and for static installations like building facades (BIPV) where sun-tracking is impractical. Statement-II is incorrect. It describes the mechanism of Concentrated Solar Power (CSP), not LSCs. LSCs use luminophores (dyes or quantum dots) to absorb light and guide it via total internal reflection to solar cells at the edges; they do not use mirrors and do not require sun-tracking, which is one of their key advantages.
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Current AffairsHard
Q139.With reference to the International Solar Alliance (ISA), consider the following statements:
1. The ISA framework is open exclusively to countries located entirely between the Tropic of Cancer and the Tropic of Capricorn.
2. Its primary objective is to serve as the principal platform for international cooperation on all forms of renewable energy.
3. The permanent secretariat of the ISA is headquartered in Abu Dhabi, UAE.
How many of the statements given above are correct?
Explanation: Statement 1 is incorrect. The alliance is open to solar resource-rich countries lying 'fully or partially' between the tropics, not exclusively entirely between them. Statement 2 is incorrect. This describes the broader mandate of the International Renewable Energy Agency (IRENA). The ISA's objective is focused specifically on solar energy. Statement 3 is incorrect. The secretariat of the ISA is located at the National Institute of Solar Energy in Gurgaon, India. Abu Dhabi is the headquarters of IRENA. Therefore, none of the statements are correct.
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Current AffairsMedium
Q140.Consider the following pairs:
Technology/Initiative : Core Mechanism/Component
1. Photovoltaic Electricity : Direct conversion of photons to electrons in semiconductor layers.
2. Concentrated Solar Power : Using mirrored surfaces to heat a fluid for steam generation.
3. One Sun One World One Grid : A technology using fuel cells for transnational power supply.
How many of the pairs given above are correctly matched?
Explanation: Pair 1 is correctly matched. Photovoltaic (PV) cells are made of semiconductor materials that absorb photons from sunlight and release electrons, generating an electric current. Pair 2 is correctly matched. Concentrated Solar Power (CSP) uses mirrors or lenses to concentrate sunlight onto a receiver, which heats a fluid to produce steam and drive a turbine. Pair 3 is incorrectly matched. One Sun One World One Grid (OSOWOG) is an initiative to create a transnational electricity grid for supplying power globally; it is not a specific technology that uses fuel cells. Fuel cells are a separate energy source.
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Current AffairsMedium
Q141.With reference to sources of energy, consider the following statements:
1. All renewable energy sources, by definition, are constantly replenished and do not contribute to any form of pollution.
2. Co-generation involves producing two forms of energy, such as electricity and heat, from a single fuel source.
3. Geothermal energy harnessed from sources like magma and natural geysers is classified as a primary, renewable energy source.
Which of the statements given above is/are correct?
Explanation: Statement 1 is incorrect. The use of the absolute term 'All' makes the statement incorrect. While renewable energy sources are generally cleaner than fossil fuels, some can cause pollution. For example, the combustion of biomass releases particulate matter and contributes to air pollution. Large-scale hydroelectric projects can cause significant ecological disruption and habitat loss. The manufacturing of solar panels and wind turbines also has an environmental footprint.
Statement 2 is correct. This is the standard definition of co-generation, also known as Combined Heat and Power (CHP). It is an energy-efficient technology that generates electricity and also captures the waste heat for useful thermal applications, thereby improving the overall efficiency of the fuel used.
Statement 3 is correct. Geothermal energy is heat from the Earth's interior. It is considered a primary energy source because it is harnessed directly from nature. It is classified as renewable because the Earth's internal heat is vast and continuously produced by the slow decay of radioactive particles, making it practically inexhaustible on human timescales.
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