Day 116
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Question 1 of 5
1. Question
2 points1. Consider the following situation:
“DDT chemical was being used as an insecticide in farms of the certain area. Over the years, the amount of DDT in the nearby lake increased due to water runoff from the farms. Lake is an important habitat for migratory birds and waterfowls. After a few years, it was found that birds were dying and their number declined substantially.”
Which of the following phenomenon could probably be responsible for the above situation?Correct
Answer: D
Explanation:
• Biomagnification refers to an increase in the concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolized or excreted and is thus passed on to the next higher trophic level. This phenomenon is well-known for mercury and DDT.
• High concentrations of DDT in fish-eating birds disturb calcium metabolism in birds, which causes thinning of eggshells and their premature breaking, eventually causing the decline in bird populations.Incorrect
Answer: D
Explanation:
• Biomagnification refers to an increase in the concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolized or excreted and is thus passed on to the next higher trophic level. This phenomenon is well-known for mercury and DDT.
• High concentrations of DDT in fish-eating birds disturb calcium metabolism in birds, which causes thinning of eggshells and their premature breaking, eventually causing the decline in bird populations. -
Question 2 of 5
2. Question
2 points2. Consider the following statements about National Air Quality Index
- It measures the air quality based on six pollutants.
- It is developed by the Central Pollution Control Board(CPCB).
- It was launched in 2010.
Which of the statements given above is/are incorrect?
Correct
Answer: A
Explanation:
- Statement 1 is incorrect. National Air Quality Index measures air quality based on eight pollutants.
- Statement 2 is correct. It is developed by CPCB. Statement 3 is incorrect. National Air Quality Index was launched on 17th October 2014
Incorrect
Answer: A
Explanation:
- Statement 1 is incorrect. National Air Quality Index measures air quality based on eight pollutants.
- Statement 2 is correct. It is developed by CPCB. Statement 3 is incorrect. National Air Quality Index was launched on 17th October 2014
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Question 3 of 5
3. Question
2 points3. Consider the following statements about Nutrient Cycling
- The Phosphorous cycle is a sedimentary nutrient cycle.
- The sulfur cycle is a gaseous nutrient cycle.
Which of the statements given above is/are incorrect?
Correct
Answer: B
Explanation:
- Statement 1 is correct. The Phosphorous cycle is a sedimentary nutrient cycle.
- Statement 2 is incorrect. The sulfur cycle is mostly sedimentary except hydrogen sulfide and sulfur dioxide, which add a gaseous cycle to its normal sedimentary cycle.
Incorrect
Answer: B
Explanation:
- Statement 1 is correct. The Phosphorous cycle is a sedimentary nutrient cycle.
- Statement 2 is incorrect. The sulfur cycle is mostly sedimentary except hydrogen sulfide and sulfur dioxide, which add a gaseous cycle to its normal sedimentary cycle.
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Question 4 of 5
4. Question
2 points4. Which of the following convention is related to the protection of the ozone layer?
Correct
Answer: A
Explanation.
- Vienna Convention is to preserve human health and to protect the environment from any harmful effects of the depletion of the ozone layer. Rotterdam Convention is an international treaty designed to facilitate informed decision-making by countries with regard to trade in hazardous chemicals
- Stockholm Convention on Persistent Organic Pollutants is a multilateral environmental agreement to protect human health and the environment
Incorrect
Answer: A
Explanation.
- Vienna Convention is to preserve human health and to protect the environment from any harmful effects of the depletion of the ozone layer. Rotterdam Convention is an international treaty designed to facilitate informed decision-making by countries with regard to trade in hazardous chemicals
- Stockholm Convention on Persistent Organic Pollutants is a multilateral environmental agreement to protect human health and the environment
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Question 5 of 5
5. Question
2 points5. Which of the following is not an example of ex-situ conservation of the species?
Correct
Answer: B
Explanation:
- Ex-situ conservation: In this, the threatened animals and plants are taken away from their natural habitat and placed in a unique setting where they can be protected and given special care. E.g. Zoological parks, botanical gardens, seed banks.
- In-situ conservation: Animal and plant species are protected in their natural habitat itself. E.g. National parks, Wildlife sanctuaries, Biosphere reserve, Community reserve, Conservation reserve etc.
Incorrect
Answer: B
Explanation:
- Ex-situ conservation: In this, the threatened animals and plants are taken away from their natural habitat and placed in a unique setting where they can be protected and given special care. E.g. Zoological parks, botanical gardens, seed banks.
- In-situ conservation: Animal and plant species are protected in their natural habitat itself. E.g. National parks, Wildlife sanctuaries, Biosphere reserve, Community reserve, Conservation reserve etc.
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