Question 1

Consider the following statements regarding global biodiversity:
1. The best estimate for the number of species globally is 10 million, within a broader estimated range of 2 to 100 million.
2. As one moves from the tropical regions towards the polar regions, there is a general trend of encountering larger populations of a greater variety of species.
3. The current state of global biodiversity is the result of evolutionary processes spanning approximately 2.5 to 3.5 million years.
How many of the above statements are correct?

Accepted Answer

Only one. Statement 1 is correct. The text explicitly states that the number of species globally varies from 2 million to 100 million, with 10 million being the best estimate. Statement 2 is incorrect. This is a pattern reversal. The text states, 'As one approaches the polar regions, one finds larger and larger populations of fewer and fewer species.' This means the variety of species decreases, not increases. Statement 3 is incorrect. This is a numerical distortion trap. The text specifies that biodiversity is the result of '2.5-3.5 billion years of evolution', not million. Therefore, only one statement is correct.

Question 2

Consider the following statements:
Statement I: Biodiversity is not found evenly on the earth; it is consistently richer in the tropics.
Statement II: The primary cause for variations in the weathering mantle and resultant biodiversity is the input of solar energy and water, which are most abundant in tropical regions.
Which one of the following is correct in respect of the above statements?

Accepted Answer

Both Statement I and Statement II are correct and Statement II is the correct explanation for Statement I.. Statement I is correct. The text clearly states, 'Biodiversity is not found evenly on the earth. It is consistently richer in the tropics.' Statement II is also correct. The text mentions, 'The basic cause for such weathering variations and resultant biodiversity is the input of solar energy and water.' It also implies these inputs are highest in the tropics, which are 'rich in these inputs'. Statement II provides the direct causal mechanism for the geographical pattern described in Statement I. The high input of solar energy and water in the tropics leads to a deep weathering mantle, which supports a wide diversity of vegetation, forming the base for overall high biodiversity. Therefore, both statements are correct, and Statement II is the correct explanation for Statement I.

Question 3

Consider the following statements regarding the relationship between biodiversity and ecosystem stability:
Statement I: An ecosystem with a higher variety of species is generally more stable and productive.
Statement II: A greater diversity of species enhances an ecosystem's capacity to adapt to environmental changes and survive adversities.
Statement III: The loss of species diminishes an ecosystem's ability to perform essential functions like nutrient cycling and energy capture, thereby reducing its ability to maintain itself.
Which one of the following is correct in respect of the above statements?

Accepted Answer

Statements I, II, and III are correct, and both II and III provide the correct explanation for I.. Statement I is a correct assertion based on the provided text. The text states that a more diverse ecosystem is more productive and has better chances to survive adversities. This directly supports Statement II. The text also states that species perform crucial functions and their loss decreases the system's ability to maintain itself, which validates Statement III. Both Statement II (adaptability) and Statement III (functional integrity) are the underlying reasons why a higher variety of species leads to a more stable and productive ecosystem as stated in Statement I. Therefore, all three statements are correct, and II and III together provide a comprehensive explanation for I.

Question 4

Consider the following features with reference to the ecosystem diversity depicted in Indira Gandhi National Park:
1. Coexistence of grasslands and tropical montane forests known as Sholas.
2. Location within the Annamalai Hills.
3. Situated as a part of the Eastern Ghats.
How many of the above statements are correct?

Accepted Answer

Only two. Statement 1 is correct: The image note for Figure 14.1 explicitly identifies the park as having grasslands and sholas, presenting it as an example of ecosystem diversity. Statement 2 is correct: The image note specifies the location as Indira Gandhi National Park, Annamalai. Statement 3 is incorrect: The Annamalai Hills, and consequently the Indira Gandhi National Park, are a prominent part of the Western Ghats, not the Eastern Ghats. This is a spatial swap trap. Therefore, only two of the three statements are correct.

Question 5

Consider the following statements:

Statement-I: The conceptualization of biodiversity primarily as a reservoir of resources for human use is identified as a significant factor contributing to its deterioration.

Statement-II: This resource-centric view drives the large-scale extraction of materials for food, pharmaceutical, and cosmetic industries, and is also cited as a source of new conflicts over the appropriation of natural resources.

Which one of the following is correct in respect of the above statements?

Accepted Answer

Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I.. Statement-I is correct. Viewing biodiversity primarily as a 'reservoir of resources' for human consumption directly leads to practices of over-exploitation that cause its deterioration. Statement-II is also correct. It specifies the mechanisms of this deterioration by identifying the large-scale extraction for food, pharmaceutical, and cosmetic industries as a direct consequence of this viewpoint. It also correctly identifies that this perspective generates new conflicts over the division and appropriation of these natural resources. Therefore, Statement-II provides the specific causes and effects that logically explain the general assertion made in Statement-I.

Question 6

Consider the following statements regarding the functional roles of biodiversity:

1. The concept of 'agro-biodiversity' is primarily classified under the economic role of biodiversity.
2. The ethical argument for conservation posits that species possess an intrinsic right to exist, irrespective of their direct utility to humans.
3. Understanding the evolutionary pathways of life and the specific function of each species within an ecosystem falls under the ecological role of biodiversity.

How many of the above statements are correct?

Accepted Answer

Only two. Statement 1 is correct. The text places 'crop diversity', also called agro-biodiversity, directly under the section 'Economic Role of Biodiversity' as a source of food. Statement 2 is correct. The text describes the ethical responsibility, stating 'each and every species along with us have an intrinsic right to exist,' which is independent of its utility. Statement 3 is incorrect. This is a 'Conceptual Swap' trap. The text categorizes understanding 'how life evolved and will continue to evolve' and 'the role of each species' under the 'Scientific Role of Biodiversity,' not the ecological role. The ecological role pertains to the functions species perform (e.g., nutrient cycling, climate regulation), not the human scientific understanding of those functions. Therefore, only two statements are correct.

Question 7

Consider the following rows regarding the classification of threatened species by the International Union of Conservation of Nature and Natural Resources (IUCN): 
Row 1: Endangered Species - Includes species which are in danger of extinction and are listed in the Red List. 
Row 2: Vulnerable Species - Includes species whose population is very small and confined to limited areas or thinly scattered. 
Row 3: Rare Species - Includes species likely to be in danger of extinction in the near future if threatening factors continue. 
In how many of the above rows is the given information correctly matched?

Accepted Answer

Only one row. Statement-by-statement analysis: 
- Row 1 is correctly matched. Endangered species are defined as those in danger of extinction, and the IUCN's Red List is the publication for this information. 
- Row 2 is incorrectly matched. The definition provided, 'population is very small and confined to limited areas', describes Rare Species, not Vulnerable Species. Vulnerable species are those likely to become endangered in the near future. 
- Row 3 is incorrectly matched. The definition provided, 'likely to be in danger of extinction in the near future', describes Vulnerable Species, not Rare Species. Rare species are defined by their very small and geographically restricted populations. 
Therefore, only one row is correctly matched.

Question 8

Consider the following statements regarding threats to biodiversity: 
1. Tropical regions, which contain approximately 50% of the earth's species, occupy about one-fourth of the world's total area. 
2. The introduction of exotic species, which are non-natural inhabitants of a local habitat, has caused extensive damage to natural biotic communities. 
3. Tropical regions contain about three-fourths of the world's human population, a factor contributing to the over-exploitation of resources. 
How many of the statements given above are correct?

Accepted Answer

All three. Statement 1 is correct. Tropical regions are characterized by a high concentration of biodiversity. Specifically, tropical rainforests, a key biome within these regions, host about 50% of the planet's species while the regions themselves cover only about a quarter of the world's total area. Statement 2 is correct. Exotic species are organisms introduced into habitats where they are not native. Their presence can lead to severe ecological disruption and extensive damage to the local biotic community, as they may outcompete native species, introduce diseases, or alter the habitat. Statement 3 is correct. A significant demographic pressure exists in tropical regions, which are home to approximately three-fourths of the global human population. This high population density drives increased consumption and over-exploitation of natural resources, accelerating biodiversity loss. Since all three statements are factually correct, the correct option is (c).

Question 9

Based on the provided information and common knowledge regarding species conservation status, consider the following statements: 
1. The Red Panda is classified as an endangered species and is known to inhabit arboreal ecosystems. 
2. Humbodtia decurrens Bedd is identified as a highly rare endemic tree species found in the Northern Western Ghats of India. 
3. Natural calamities such as volcanic eruptions and droughts are considered significant threats to the biodiversity of affected regions. 
How many of the statements given above are correct?

Accepted Answer

Only two. Statement-by-statement analysis: 
- Statement 1 is correct. The image caption identifies the Red Panda as an 'endangered species'. The visual of it on a tree branch confirms its arboreal habitat, which is consistent with its known ecology. 
- Statement 2 is incorrect. The image caption for Humbodtia decurrens Bedd explicitly states its location as the 'Southern Western Ghats (India)'. The statement incorrectly places it in the 'Northern Western Ghats', which is a spatial swap trap. 
- Statement 3 is correct. The text clearly lists 'volcanic eruptions' and 'droughts' among the natural calamities that 'cause damage to the flora and fauna of the earth, bringing change the biodiversity of respective affected regions'. 
Therefore, only two statements (1 and 3) are correct.

Question 10

Consider the following countries:
1. Peru
2. Madagascar
3. South Africa
4. Malaysia

How many of the above are officially recognized as 'mega diversity centres'?

Accepted Answer

Only three. The globally recognized list of 12 mega diversity centres includes Mexico, Columbia, Ecuador, Peru, Brazil, Democratic Republic of Congo, Madagascar, China, India, Malaysia, Indonesia, and Australia. Statement 1 is correct as Peru is on the list. Statement 2 is correct as Madagascar is also on the list. Statement 3 is incorrect because South Africa is not on the list; the text identifies the Democratic Republic of Congo as a mega diversity centre in Africa. Statement 4 is correct as Malaysia is on the list. Therefore, since three of the listed countries (Peru, Madagascar, Malaysia) are mega diversity centres, the correct count is three.

Question 11

Consider the following statements regarding biodiversity conservation in India:
Statement I: The primary objective of the Wild Life (Protection) Act, 1972, was to regulate the international trade in wild plants and animals.
Statement II: The Act facilitated the establishment of national parks and sanctuaries, and the declaration of biosphere reserves to protect, preserve, and propagate species within their natural boundaries.
Which one of the following is correct in respect of the above statements?

Accepted Answer

Statement I is incorrect but Statement II is correct. Statement I is incorrect. The primary purpose of the Wild Life (Protection) Act, 1972, was to 'protect, preserve and propagate the variety of species within natural boundaries'. While the regulation of international trade in wildlife is a conservation step suggested by the world conservation strategy, it was not the stated primary objective of this specific Act. Statement II is correct. The Act explicitly provided the legal framework under which national parks, sanctuaries, and biosphere reserves were established and declared to achieve its primary conservation goals.

Question 12

Consider the following steps suggested by the world conservation strategy for biodiversity conservation:
1. Preservation of endangered species.
2. Identification and protection of habitats of wild relatives of food crops and timber trees.
3. Safeguarding habitats where species feed, breed, and rest.
4. Promotion of international trade in wild plants and animals to fund conservation efforts.

How many of the above steps are correctly stated?

Accepted Answer

Only three. Statement 1 is correct, as the strategy suggests that efforts should be made to preserve endangered species. Statement 2 is correct, as the strategy advises that each country should identify habitats of wild relatives and ensure their protection. Statement 3 is correct, as the strategy recommends that habitats where species feed, breed, rest, and nurse their young should be safeguarded. Statement 4 is incorrect. The strategy suggests that international trade in wild plants and animals should be 'regulated', not 'promoted'. Promotion implies encouragement, which is contrary to the goal of conservation. Therefore, only three of the statements are correct.

Question 13

Consider the following statements regarding biodiversity hotspots:
1. Hotspots are primarily defined and identified based on their faunal diversity.
2. The primary productivity of an ecosystem, a key consideration for hotspot identification, is determined by its plant life.
3. In hotspots within wealthy nations, such as the Hawaiian islands, threats are often driven by introduced species and land development.

How many of the above statements are correct?

Accepted Answer

Only two. Let's analyze each statement based on the provided text.
- Statement 1 is incorrect. The text explicitly states, 'Hotspots are defined according to their vegetation. Plants are important because...'. This statement swaps 'vegetation' (flora) with 'faunal diversity' (fauna), making it false.
- Statement 2 is correct. The text directly supports this by stating, 'Plants are important because these determine the primary productivity of an ecosystem.'
- Statement 3 is correct. The text provides a specific example: 'The islands of Hawaii have many unique plants and animals that are threatened by introduced species and land development.' This confirms that threats in wealthy nations' hotspots can differ from those in others.
Thus, only two statements (2 and 3) are correct.

Question 14

Consider the following pairs:
Row 1: Convention of Biodiversity (1992) : Led to the enactment of the Wild Life (Protection) Act, 1972 in India.
Row 2: World Conservation Strategy : Recommended the regulation of international trade in wild plants and animals.
Row 3: IUCN : Identifies and designates the 12 'mega diversity centres'.

In how many of the above rows is the given information correctly matched?

Accepted Answer

Only one row. Let's evaluate the accuracy of each row.
- Row 1 is incorrectly matched. The Wild Life (Protection) Act was passed in 1972, twenty years before the Convention of Biodiversity was signed at the Rio Earth Summit in 1992. The Act was a domestic initiative of the Government of India and was not a result of the later international convention.
- Row 2 is correctly matched. The text lists several steps suggested by the world conservation strategy, including point (vi) which states, 'International trade in wild plants and animals be regulated.'
- Row 3 is incorrectly matched. The text states that the IUCN 'has identified certain areas as biodiversity hotspots.' It separately lists the 12 mega diversity centres without attributing their designation to the IUCN. The roles are distinct.
Therefore, only one row (Row 2) is correctly matched.

Question 15

Consider the following statements regarding the geographical location of biodiversity hotspots based on the provided analysis:
1. The Equator passes through the 'Tropical Andes' hotspot.
2. The Tropic of Cancer passes south of the 'Eastern Himalaya' hotspot.
3. The Tropic of Capricorn passes through the 'Eastern Madagascar' hotspot.
How many of the above statements are correct?

Accepted Answer

Only two. Statement 1 is incorrect. The analysis states the Equator crosses through the 'Western Ecuador and Colombian Choco' hotspot, which is geographically distinct from the 'Tropical Andes'. The 90°W longitude line, which is west of the Tropical Andes, passes through the Gulf of Mexico, further indicating the Andes are not on the Equator. Statement 2 is correct. The analysis explicitly mentions that the Tropic of Cancer (approx. 23.5°N) passes south of the 'Eastern Himalaya' hotspot. Statement 3 is correct. The analysis explicitly states that the Tropic of Capricorn (approx. 23.5°S) passes through the 'Eastern Madagascar' hotspot. Therefore, only two statements (2 and 3) are correct.

Question 16

Consider the following rows matching a biodiversity hotspot to its specific associated region or location:
Row 1: Melanesia : New Caledonia
Row 2: Australian Hotspot : Queensland
Row 3: South American West Coast : Atlantic Forest, Brazil
Row 4: African Hotspots : Upper Guinean Forests and Eastern Arc Mountains
In how many of the above rows is the hotspot correctly matched with its associated region/location?

Accepted Answer

Only three rows. Row 1 is correctly matched. The analysis notes that 'The 'Melanesia' hotspot is specifically associated with 'New Caledonia' in parentheses.' Row 2 is correctly matched. The analysis specifies that 'The hotspot in Australia is specifically located in 'Queensland' on the northeastern coast.' Row 3 is incorrectly matched. This is a 'Spatial Swap' trap. The analysis clarifies that South America has the 'Tropical Andes' on the west coast and the 'Atlantic Forest, Brazil' on the east coast. Row 4 is correctly matched. The analysis identifies three hotspots in Africa: 'Upper Guinean Forests' in the west, and 'Eastern Arc Mountains, Tanzania' and 'Eastern Madagascar' in the east. The row correctly lists two of these. Therefore, three rows (1, 2, and 4) are correctly matched.

Biodiversity And Conservation

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