Q10 of 55 Page 117

How has DDT caused decline in bird population?

The process of increasing concentration of DDT and other heavy metals in the bodies of the organisms at relatively higher trophic level in the food chain is called Biomagnification.


The calcium metabolism of birds is disturbed due to the presence of high concentrations of DDT in their bodies which causes thinning of egg shells and their premature breaking. Due to this, the bird population declines.


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