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Drawback of DDT as pesticide is

 (a) it becomes ineffective after some time

 (b) it is less effective than others

 (c) it is not easily/rapidly degraded in nature

  (d) its high cost

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Correct Option (c) it is not easily/rapidly degraded in nature

Explanation:

 DDT is non-degradable and so accumulates in the environment and its concentration increases as it pass from organisms of one trophic level to another resulting into highest concentration in man,

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