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Biology (MCQ)
1. Why was DDT banned which an organ chlorine compound, used first to control malaria, carried in mosquitoes and later to a variety to insect pests?
(A): (A) It brings about a change in sex chromosomes
(B): (B) It persists in the environment and bio-accumulates
(C): (C) It increases its affinity hundred-fold for haemoglobin preventing its coupling with oxygen
(D): (D) All of these
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