Assertion :Agricultural output increased several times after introduction of DDT. Reason: DDT was the first insecticide used on a wide scale.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
DDT (dichloro diphenyl trichloroethane) is a chemical insecticide that kills by acting as a nerve poison. DDT was first used on a wide scale during world war II to control typhus which was spread by body louse. Since, then it has been used to control mosquito-borne malaria and was used extensively as a general agricultural insecticide.
Therefore, the correct answer is option A.

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