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Question 1 of 5
1. Question
2 points
1. Consider the following description:
“There is a gradual change in the species composition of a given area over a period. One community of species replace the other species in that area. It is a very slow process.”
Which of the following process is described in the paragraph?
Correct
Answer: C
Explanation:
The gradual and fairly predictable change in the species composition of a given area is called ecological succession. During succession, some species colonise an area and their population become more numerous whereas populations of other species decline and even disappear.
Incorrect
Answer: C
Explanation:
The gradual and fairly predictable change in the species composition of a given area is called ecological succession. During succession, some species colonise an area and their population become more numerous whereas populations of other species decline and even disappear.
Question 2 of 5
2. Question
2 points
2. Consider the following statements:
In general, biodiversity goes on increasing from the equator to poles on the earth’s surface.
More the biological diversity in an ecosystem, more chances of it adapting to the environmental change.
Exotic species reduces the biological diversity of an ecosystem.
Which of the statements given above are incorrect?
Correct
Answer: A
Explanation:
Statement 1 is incorrect: In general, biodiversity goes on decreasing from equator to poles on the earth’s surface.
Statement 2 is correct: When there is more biological diversity in an ecosystem, it has more chances of adapting to the environmental change. The more diverse an ecosystem, better are the chances for the species to survive through adversities and attacks, and consequently, is more productive.
Statement 3 is correct: Natural biotic community of the ecosystem suffer extensive damage because of the introduction of exotic species. (Species which are not the natural inhabitants of the local habitat but are introduced into the system, are called exotic species).
Incorrect
Answer: A
Explanation:
Statement 1 is incorrect: In general, biodiversity goes on decreasing from equator to poles on the earth’s surface.
Statement 2 is correct: When there is more biological diversity in an ecosystem, it has more chances of adapting to the environmental change. The more diverse an ecosystem, better are the chances for the species to survive through adversities and attacks, and consequently, is more productive.
Statement 3 is correct: Natural biotic community of the ecosystem suffer extensive damage because of the introduction of exotic species. (Species which are not the natural inhabitants of the local habitat but are introduced into the system, are called exotic species).
Question 3 of 5
3. Question
2 points
3. Consider the following:
Greenhouse gases in the earth’s atmosphere absorb longwave radiations emitted from the sun.
Increase in amount of greenhouse gases in atmosphere leads to global warming.
Carbon dioxide is the largest contributor to the global warming among the greenhouse gases.
Which of the statements given above is/are correct?
Correct
Answer: C
Explanation:
Statement 1 is incorrect: Greenhouse gases in the earth’s atmosphere absorbs longwave radiations emitted from the earth (terrestrial radiations).
Statement 2 is correct: An increase in the amount of greenhouse gases in the atmosphere leads to global warming.
Statement 3 is correct: Carbon dioxide is the largest contributor (about 60%) to global warming among the greenhouse gases.
Incorrect
Answer: C
Explanation:
Statement 1 is incorrect: Greenhouse gases in the earth’s atmosphere absorbs longwave radiations emitted from the earth (terrestrial radiations).
Statement 2 is correct: An increase in the amount of greenhouse gases in the atmosphere leads to global warming.
Statement 3 is correct: Carbon dioxide is the largest contributor (about 60%) to global warming among the greenhouse gases.
Question 4 of 5
4. Question
2 points
4. Consider the following statements about Great Indian Bustard:
They are the largest flightless birds found in India.
Rajasthan has the highest number of Great Indian Bustard.
They face huge threats from the rising number of their natural predators.
Which of the statements given above is/are incorrect?
Correct
Answer: A
Explanation:
Statement 1 is incorrect: Great Indian Bustard is one of the most giant flying birdS in India.
Statement 2 is correct: Rajasthan has the highest population of these birds.
Statement 3 is incorrect: as they have very few natural enemies and the major threat is from habitat destruction.
Incorrect
Answer: A
Explanation:
Statement 1 is incorrect: Great Indian Bustard is one of the most giant flying birdS in India.
Statement 2 is correct: Rajasthan has the highest population of these birds.
Statement 3 is incorrect: as they have very few natural enemies and the major threat is from habitat destruction.
Question 5 of 5
5. Question
2 points
5. Consider the following statements about Gharial
Gharials are widely distributed in India.
Their habitat is threatened by sand mining.
They are categorised as critically endangered animals as per the red list published by the World Wildlife Fund.
Which of the statements given above is/are incorrect?
Correct
Answer: C
Explanation:
Statement 1 is incorrect: The gharial population has declined drastically since the 1940s and is limited to only 2% of its historical range today. Major gharial population is found in Chambal and Girna tributaries of Ganga River.
Statement 2 is correct: Sand mining is a major cause of their decline.
Statement 3 is incorrect: Although they are critically endangered, the red list is published by IUCN.
Incorrect
Answer: C
Explanation:
Statement 1 is incorrect: The gharial population has declined drastically since the 1940s and is limited to only 2% of its historical range today. Major gharial population is found in Chambal and Girna tributaries of Ganga River.
Statement 2 is correct: Sand mining is a major cause of their decline.
Statement 3 is incorrect: Although they are critically endangered, the red list is published by IUCN.
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