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Question
Assertion :DDT shows biological magnification. Reason: UV radiations cause ozone depletion.
Assertion :DDT shows biological magnification. Reason: UV radiations cause ozone depletion.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
DDT is a non-biodegradable insecticide. It enters water bodies due to runoff from fields. Dichlorodiphenyltrichloroethane or DDT is a crystalline, colourless and odourless compound which is used as an insecticide. DDT on runoff from the fields reach the water bodies and gets accumulated in the bodies of fishes. When fishes are eaten by birds, it gets accumulated in the body of birds and hence, in this way it gets incorporated in the food chain. It is fat soluble and gets deposited in the fatty tissue of animals. With each successive trophic level, concentration of DDT increases and this is known as biomagnification. Hence, assertion is correct.Ozone depletion is caused by CFCs or Chlorofluorocarbons and not by UV radiations. Hence, reason is incorrect.So, the correct answer is 'Assertion is correct but Reason is incorrect'.
DDT is a non-biodegradable insecticide. It enters water bodies due to runoff from fields. Dichlorodiphenyltrichloroethane or DDT is a crystalline, colourless and odourless compound which is used as an insecticide. DDT on runoff from the fields reach the water bodies and gets accumulated in the bodies of fishes. When fishes are eaten by birds, it gets accumulated in the body of birds and hence, in this way it gets incorporated in the food chain. It is fat soluble and gets deposited in the fatty tissue of animals. With each successive trophic level, concentration of DDT increases and this is known as biomagnification. Hence, assertion is correct.
Ozone depletion is caused by CFCs or Chlorofluorocarbons and not by UV radiations. Hence, reason is incorrect.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.
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