NEET 2012 Biology question

In an area where DDT had been used extensively, the population of birds declined significantly because

(1)Many of the birds eggs laid, did not hatchCorrect
(2)Birds stopped laying eggs
(3)Earthworms in the area got eradicated
(4)Cobras were feeding exclusively on birds

Answer: (1)

Solution

DDT is not metabolised and undergoes biomagnification: its concentration increases at successive trophic levels, reaching the highest level in top carnivores such as birds of prey. High DDT concentration disturbs calcium metabolism

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Question ID VK-091168