Draw back of DDT as pesticides is that -

It is less effective than others

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It becomes ineffective after some times

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It is a non degradable substance

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It is very costly

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Solution

The correct option is C
It is a non degradable substance

DDT -Dichlorophenyltrichloroethane is a pesticides ,which was used as effective way for preventing malaria and of low cost, but one of disadvantages is it moves up a food chain,many side effects on human harmone function and which leads to side effects in terms of growth and fertility.

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