Indian Biodiversity Diverse Landscape

Q1.Consider the following statements regarding climate change and global warming: 1. Climate change is defined as an average increase in the temperature of the atmosphere near the Earth's surface and in the troposphere. 2. In common usage, 'climate change' refers to climatic shifts over the last 100 years caused predominantly by human activity. 3. Global warming can occur from a variety of causes, both natural and human induced. How many of the statements given above are correct?

Q2.With reference to the Greenhouse Effect, consider the following statements: 1. In the absence of the naturally occurring greenhouse effect, the average temperature of the Earth's surface would be 15°C. 2. The Sun's energy is emitted in high-energy short wavelengths that are largely unable to penetrate the Earth's atmosphere. 3. The greenhouse effect is a process caused exclusively by human-generated emissions which upset the natural balance of the atmosphere. How many of the statements given above are correct?

Q3.Consider the following phenomena: 1. Loss of Plankton due to cooling of seas 2. Spread of diseases like malaria 3. Widespread vanishing of animal populations due to habitat loss 4. Bleaching of Coral Reefs How many of the above are considered impacts of global warming?

Q4.Consider the following statements regarding ocean chemistry and saturation levels: 1. The lysocline represents the depth in the ocean at which all carbonate completely dissolves. 2. The saturation horizon for aragonite is found at a greater ocean depth compared to the saturation horizon for calcite. 3. A decrease in ocean pH leads to a shallowing of the Carbonate Compensation Depth (CCD). How many of the statements given above are correct?

Q5.Consider the following statements regarding the Earth's carbon cycle and its balancing mechanisms: 1. Carbonate compensation is an oceanic feedback mechanism that operates over timescales of tens of thousands of years to stabilize the carbon cycle. 2. On short timescales, rock weathering on land is the principal process that counteracts the current anthropogenic input of CO2. 3. The dissolution of calcium carbonate shells from sediments in deep water can buffer ocean acidification, but this process takes place over a thousand-year timescale. How many of the statements given above are correct?

Q6.Consider the following statements regarding coastal upwelling and ocean acidification: 1. Upwelling events bring warm, nutrient-poor surface water to coastal regions. 2. Due to ocean acidification, upwelling events are increasingly bringing oversaturated water to the shore, benefiting shell-forming organisms. 3. Coastal marine organisms are generally well-adapted to the chemical conditions brought about by periodic upwelling. How many of the statements given above are correct?

Q7.Consider the following statements regarding ozone in the atmosphere: 1. Ozone present in the troposphere is considered beneficial as it protects life by absorbing harmful ultraviolet radiation. 2. The primary function of the stratospheric ozone layer is to prevent the formation of smog at lower altitudes. 3. The ozone layer protects oxygen molecules in the lower atmosphere from being broken up by the action of ultraviolet light. How many of the statements given above are correct?

Q8.With reference to the measurement of atmospheric ozone, consider the following statements: 1. The Dobson unit is a direct measure of the concentration of ozone molecules per cubic meter at a specific altitude. 2. The Dobson spectrophotometer and the Total Ozone Mapping Spectrometer (TOMS) are both satellite-based instruments for measuring the ozone layer. 3. The Dobson unit is defined as the thickness of the ozone column when compressed at Standard Temperature and Pressure (STP). How many of the statements given above are correct?

Q9.Consider the following statements regarding ozone depletion: 1. The current imbalance in the ozone layer is characterized by the rate of ozone formation being much faster than the rate of its destruction. 2. The ozone hole that develops annually over the Arctic is significantly larger than the one that develops over Antarctica. 3. Stable compounds such as HCL and CLONO2 act as direct agents of ozone destruction immediately upon their release into the atmosphere. How many of the statements given above are correct?

Q10.With reference to Chlorofluorocarbons (CFCs), consider the following statements: 1. The primary application of CFCs, constituting the majority of their use, is as fire extinguishing agents. 2. They are employed as foaming agents in the manufacturing of plastics. 3. A significant portion, approximately one-third of their total use, is as blowing agents in foam insulation products. How many of the statements given above are correct?

Q11.Consider the following statements regarding sources of ozone-depleting substances: 1. Nitrous oxide ($N_2O$) is released into the atmosphere from the use of solvents for cleaning electronic and metallic components. 2. Methyl chloroform is a major substance released from the denitrification of nitrates in agricultural soils. 3. Explosions of thermonuclear weapons are a source of nitrogen oxides that can reach the stratosphere. How many of the statements given above are correct?

Q12.Consider the following statements regarding the chemistry of ozone depletion: 1. A single bromine atom is less effective at destroying ozone than a single chlorine atom. 2. In the stratosphere, CFC molecules are broken down by UV radiation, which frees chlorine atoms to react with ozone. 3. The catalytic cycle of ozone depletion involves the reformation of the chlorine atom, allowing it to destroy thousands of ozone molecules. How many of the statements given above are correct?

Q13.Consider the following statements regarding Polar Stratospheric Clouds (PSCs) and ozone depletion: 1. The ice particles of PSCs provide a substrate that significantly slows down the chemical reaction between HCl and ClONO₂. 2. PSCs contribute to ozone depletion by absorbing reactive nitrogen, which would otherwise combine with chlorine monoxide to form a stable reservoir. 3. All types of PSCs are characterized by a 'mother-of-pearl' iridescence and are composed primarily of pure water. How many of the statements given above are correct?

Q14.Consider the following statements regarding the seasonal cycle of ozone depletion over the Antarctic: 1. The polar vortex, a ring of rapidly circulating air, begins to break down in September with the return of sunlight. 2. The lowest levels of ozone are typically reached during the peak winter months of July and August. 3. During July and August, the stratosphere is denitrified and dehydrated through precipitation from Polar Stratospheric Clouds. How many of the statements given above are correct?

Q15.Consider the following statements: Statement I: Ozone depletion over the Arctic has been increasingly evident, caused in part by a dramatic cooling of the upper atmosphere in northern latitudes. Statement II: A primary factor enhancing Arctic ozone depletion is the longevity of the Arctic vortex, which remains stable throughout the polar winter and well into mid-spring. Which one of the following is correct in respect of the above statements?

Q16.With reference to the Ozone Depleting Substances (Regulation and Control) Rules, 2000 and its amendments, consider the following statements: 1. The use of Chlorofluorocarbons (CFCs) in manufacturing all products was completely prohibited after 1st January 2003 without any exceptions. 2. The use of halons was prohibited after 1st January 2001, except for uses deemed essential. 3. Hydrochlorofluorocarbons (HCFCs), serving as interim substitutes, are permitted for use until 1st January 2040. How many of the statements given above are correct?

Q17.Consider the following statements regarding the impacts of increased UV-B radiation on air quality: 1. Increased UV-B penetration to the lower atmosphere results in higher photo dissociation rates of key trace gases. 2. The subsequent increase in tropospheric reactivity leads to a decrease in the production of particulates such as cloud condensation nuclei. 3. Changes in the atmospheric concentrations of the hydroxyl radical (OH) can alter the atmospheric lifetimes of gases like methane. How many of the statements given above are correct?

Q18.Consider the following statements regarding the environmental effects of ozone depletion: 1. In terrestrial plants, indirect changes such as altered biomass allocation and developmental timing can be more significant than direct damaging effects of UV-B. 2. Solar UV-B radiation has been shown to primarily affect orientation mechanisms and motility in the early developmental stages of fish, shrimp, and crabs. 3. In susceptible human populations, UV-B radiation is identified as the key risk factor for the development of non-melanoma skin cancer. How many of the statements given above are correct?

Q19.With reference to the regulation of Ozone Depleting Substances (ODS) in India, consider the following statements: 1. The Ozone Depleting Substances (Regulation and Control) Rules were first established under the Environment (Protection) Act in the year 2019. 2. The 2019 amendment to the rules prohibited the issuance of import licenses for HCFC-141b. 3. The legal framework for both the original rules and their amendments is the Environment (Protection) Act, 1986.

Q20.Consider the following statements regarding Hydrochlorofluorocarbon (HCFC)-141b: 1. India completed the phase-out of HCFC-141b by the beginning of 2020. 2. HCFC-141b is a chemical primarily utilized by the refrigeration and air-conditioning manufacturing sector. 3. The phase-out of HCFC-141b is part of India's strategic choice to transition towards energy-efficient technologies.

Q21.Consider the following statements: 1. The Ozone Depleting Substances (Regulation and Control) Amendment Rules, 2019, were enacted to facilitate the continued import of HCFC-141b. 2. The Ministry of Environment, Forest, and Climate Change (MoEFCC) is the authority responsible for decisions regarding the issuance of import licenses for substances like HCFC-141b. 3. India's phase-out of HCFC-141b was completed ahead of the schedule mandated by the Montreal Protocol.

Q22.With reference to greenhouse gases, consider the following statements: 1. Humans are directly responsible for emitting water vapour in quantities sufficient to alter its atmospheric concentration. 2. Carbon dioxide can persist in the atmosphere for a shorter duration compared to water vapour. 3. An increase in greenhouse gases like CO2 boosts the rate of evaporation, thereby increasing the amount of water vapour in the air. How many of the above statements are correct?

Q23.Consider the following statements regarding the sources of Methane (CH4): 1. Globally, the industrial sector is the primary source of human-induced methane emissions. 2. In wetlands, methane is emitted from bacteria that decompose organic materials in the presence of oxygen. 3. The normal digestive process of domestic livestock such as cattle and goats is a source of methane. How many of the above statements are correct?

Q24.With reference to Carbon Dioxide (CO2), consider the following statements: 1. The production of cement and steel can result in CO2 emissions through chemical reactions that do not involve combustion. 2. Human activities alter the carbon cycle solely by adding more CO2 to the atmosphere. 3. Carbon Capture and Sequestration is the most effective way to reduce carbon dioxide emissions. How many of the above statements are correct?

Q25.Consider the following statements: 1. Water vapour is the primary greenhouse gas emitted through human activities. 2. Methane is removed from the atmosphere naturally through bacterial action in soils and chemical reactions in the atmosphere. 3. Natural emissions of Nitrous Oxide (N2O) are mainly from bacteria breaking down nitrogen in soils and the oceans. 4. Considering cumulative historical emissions, the USA would be the second-largest GHG emitter. How many of the above statements are correct?

Q26.Consider the following statements regarding climate forcings: 1. Volcanic eruptions are a type of positive climate forcing because the ejected ash traps heat in the atmosphere. 2. Since the beginning of the industrial revolution, a small increase in solar energy reaching Earth has been the only natural forcing with any long-term significance. 3. Human activities are considered the primary driver of recent warming, as natural forcings alone are not significant enough to explain the observed changes. How many of the statements given above are correct?

Q27.With reference to human-generated aerosols, consider the following statements: 1. All aerosols generated from burning fossil fuels are a negative forcing, meaning they universally have a cooling effect. 2. Dark, carbon-rich particles such as soot, typically from diesel engines, reflect sunlight back to space, producing a cooling effect. 3. Light aerosols, often produced from the exhaust of high-sulphur coal, contribute to warming by absorbing the Sun's energy. How many of the statements given above are correct?

Q28.Consider the following statements regarding the properties of greenhouse gases: 1. The Global Warming Potential (GWP) of a gas is calculated based solely on how strongly it absorbs energy. 2. Greenhouse gases, due to their long atmospheric lifetimes, become well mixed, meaning their measured concentration is roughly the same globally. 3. Carbon dioxide emitted from burning fossil fuel is the largest single climate forcing agent, accounting for more than half of the total positive forcing since 1750. How many of the statements given above are correct?

Q29.Consider the following statements regarding the characteristics of greenhouse gases: 1. A greenhouse gas's Global Warming Potential (GWP) is determined exclusively by its atmospheric lifetime; a longer lifetime invariably results in a higher GWP. 2. Methane has a shorter atmospheric lifetime than Nitrous Oxide, yet it absorbs more energy per unit mass than Carbon Dioxide. 3. Sulfur hexafluoride (SF6) is classified as a high-GWP gas because, for a given amount of mass, it traps substantially more heat than CO2. How many of the above statements are correct?

Q30.With reference to the Global Warming Potential (GWP), consider the following statements: 1. An emission of one kilogram of Methane will cause 21 times as much warming as an equivalent mass of Carbon Dioxide over a 100-year period. 2. Perfluorocarbons (PFCs) invariably have a shorter atmospheric lifetime than Sulfur hexafluoride (SF6). 3. The GWP of a gas is calculated by comparing the total energy it absorbs over a 100-year period to the energy absorbed by an equivalent mass of Methane. How many of the above statements are correct?

Q31.Consider the following pairs: 1. Methane (CH4) : Atmospheric lifetime greater than 100 years 2. Nitrous Oxide (N2O) : GWP (100-year) of 21 3. Sulfur hexafluoride (SF6) : GWP (100-year) greater than 20,000 4. Perfluorocarbons (PFCs) : Atmospheric lifetime of 120 years How many of the above pairs are correctly matched?

Q32.Consider the following statements regarding Climate Tipping Points (CTPs): 1. The collapse of the Greenland ice cap is a tipping point that becomes possible only when global heating rises beyond 2°C. 2. The loss of nearly all mountain glaciers is identified as a tipping point that becomes possible at 1.5 degrees Celsius of warming. 3. Significant changes in the Indian summer monsoon are one of the nine established global tipping points identified to occur beyond 2°C of warming.

Q33.Consider the following statements: Statement I: The retreat of glaciers in regions like the Himalayas poses a significant threat to water supplies in adjacent dry countries. Statement II: The primary driver for the melting of glaciers is the increase in Greenhouse Gases, which leads to global warming. Statement III: Climate change exclusively causes variations in temperature, which in turn affects the mass balance of a glacier. Which one of the following is correct in respect of the above statements?

Q34.Consider the following pairs: (Tipping Point) : (Characteristic/Threshold) 1. Greenland Ice Cap Collapse : Disruption of a crucial current in the North Atlantic. 2. Atlantic Meridional Overturning Circulation (AMOC) Collapse : A global tipping point identified to occur beyond 2°C. 3. West African Monsoon Shift : A tipping point that becomes possible at 1.1 degrees Celsius of global heating. How many of the above pairs are correctly matched?

Q35.Consider the following statements regarding the chemical processes of ocean acidification: 1. An increased uptake of atmospheric carbon dioxide by the ocean leads to a decrease in the concentration of hydrogen ions. 2. As the pH of the oceans decreases, the concentration of carbonate ions increases. 3. The term 'ocean acidification' is applicable only when the ocean's pH falls below the neutral value of 7.0.

Q36.Consider the following statements: Statement-I: The term 'ocean acidification' is used to describe the chemical trend in oceans, even though their average pH is currently around 8.0. Statement-II: In chemical terminology, 'acidification' refers to the process of lowering pH from any starting point, regardless of whether the final state is acidic, neutral, or basic. Which one of the following is correct in respect of the above statements?

Q37.With reference to the role of oceans in the carbon cycle and the phenomenon of acidification, consider the following statements: 1. Oceans act as a significant reservoir for anthropogenic CO₂, thereby buffering climate change. 2. Ocean acidification is characterized by a decrease in the concentration of carbonate ions. 3. The process of ocean acidification results in the oceans becoming less alkaline.

Q38.Consider the following statements regarding forms of calcium carbonate in marine ecosystems: 1. Aragonite is the mineral form found in the shells of oysters and is relatively less soluble. 2. Calcite is a more soluble form of calcium carbonate found in most corals and small planktonic snails. 3. The shells of planktonic algae and echinoderms are composed of calcite.

Q39.With reference to the chemical processes of ocean acidification, consider the following statements: 1. The reaction of carbon dioxide with seawater leads to the formation of carbonic acid and a subsequent decrease in hydrogen ion concentration. 2. The overall effect of CO₂ reacting with seawater is an increase in the availability of carbonate ions for shell-building organisms. 3. The pH of ocean surface waters has increased by approximately 0.1 pH unit since the beginning of the industrial revolution.

Q40.Consider the following statements regarding factors that influence ocean acidification: 1. Acid rain has a major global impact on ocean acidification, significantly altering worldwide ocean chemistry. 2. Eutrophication in coastal waters, resulting from excess nitrogen inputs, leads to a decrease in CO₂ and an increase in seawater oxygen. 3. The uptake of atmospheric carbon dioxide by the ocean is occurring at a rate well within its natural buffering capacity.

Q41.With reference to ocean acidification, consider the following statements: 1. An increase in absorbed atmospheric CO₂ leads to an increase in the pH level of seawater. 2. The process of ocean acidification enhances the availability of carbonate ions ($CO_3^{2-}$) for marine organisms. 3. The primary building blocks for the shells and skeletons of calcifying organisms are bicarbonate ions ($HCO_3^-$). How many of the statements given above are correct?

Q42.Consider the following statements regarding the impacts of increased CO₂ levels on marine ecosystems: 1. Higher CO₂ levels uniformly increase the growth and photosynthesis of all marine phytoplankton and plant species. 2. Organisms such as hard tropical corals, molluscs, and sea urchins depend on the process of calcification. 3. For all marine plant species, rising acidity due to higher CO₂ has either a negative or a neutral physiological effect. How many of the statements given above are correct?

Q43.Consider the following pairs related to the chemistry of ocean acidification: 1. Increased atmospheric CO₂ : Increased concentration of carbonic acid 2. Calcification process : Primary use of bicarbonate ions ($HCO_3^-$) 3. Decreased seawater pH : Decreased concentration of carbonate ions ($CO_3^{2-}$) How many of the pairs given above are correctly matched?

Q44.With reference to climate change mitigation, consider the following statements: 1. A suggested strategy involves the complete cessation of offshore drilling activities. 2. Advocacy for enhanced energy efficiency is identified as a method for mitigation. 3. The primary focus of the listed government policy interventions is on capping emissions of sulfur dioxide (SO₂).

Q45.Consider the following statements: Statement I: A fundamental approach to mitigation involves a structural shift in both energy generation and consumption patterns. Statement II: Advocacy for alternative energy sources such as wind and solar is a recommended mitigation measure. Statement III: Promoting government policies to cap CO₂ emissions is a suggested mitigation strategy. Which one of the following is correct in respect of the above statements?

Q46.Consider the following actions related to mitigation strategies: 1. Promoting government policies to establish a maximum limit on CO₂ emissions. 2. Advocating for alternative energy sources like wind power. 3. Eliminating offshore drilling. How many of the above are suggested as mitigation strategies for reducing CO₂?

Q47.With reference to fluorinated gases, consider the following statements: 1. Hydrofluorocarbons (HFCs) are potent greenhouse gases that were developed as replacements for chemicals that deplete the stratospheric ozone layer. 2. Perfluorocarbons (PFCs) are primarily produced as a by-product of industrial processes like aluminum production and semiconductor manufacturing. 3. Sulfur hexafluoride (SF6) is a long-lasting gas used in electrical transmission equipment and magnesium processing. How many of the statements given above are correct?

Q48.Consider the following statements regarding atmospheric pollutants: Statement-I: Black carbon contributes to atmospheric warming by directly absorbing sunlight and by reducing the albedo when deposited on snow and ice. Statement-II: Unlike long-lived greenhouse gases such as carbon dioxide, black carbon is a solid particle with a very short atmospheric lifetime. Which one of the following is correct in respect of the above statements?

Q49.Consider the following pairs: Greenhouse Gas : Primary Anthropogenic Source 1. Methane (CH4) : Agriculture and livestock digestion 2. Nitrous Oxide (N2O) : Use of synthetic fertilizers in soil 3. Brown Carbon : Incomplete combustion of biomass How many of the pairs given above are correctly matched?

Q50.Consider the following statements regarding greenhouse gases: 1. Methane persists in the atmosphere for a shorter duration than carbon dioxide but has a more potent immediate warming effect. 2. Fluorinated gases, often used as substitutes for ozone-depleting substances, are generally the longest-lasting and most potent greenhouse gases. 3. The atmospheric concentration of water vapour is primarily and directly increased by large-scale anthropogenic emissions from industrial processes. How many of the above statements are correct?

Q51.Consider the following statements: Statement-I: Black carbon contributes to atmospheric warming by absorbing solar radiation and also accelerates the melting of glaciers. Statement-II: Black carbon is classified as a gaseous pollutant, while brown carbon, primarily from biomass burning, is classified as particulate matter. Which one of the following is correct in respect of the above statements?

Q52.Consider the following pairs: Greenhouse Gas : Primary Anthropogenic Source 1. Nitrous Oxide : Breakdown of nitrogen in livestock manure 2. Methane : Leakage from natural gas systems 3. Sulphur Hexafluoride : By-product of semiconductor manufacturing 4. Perfluorocarbons : Use as refrigerants and aerosol propellants How many of the pairs given above are correctly matched?