Multiple Choice Questions
Biomagnification of DDT causes decline in bird population by

Disturbing Ca metabolism

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Thinning of egg shells

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Premature breaking of egg shells

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All the above.

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Solution

The correct option is D All the above.
Biomagnification refers to an increase in concentration of toxic substances due to its accumulation at successive trophic levels. Biomagnification of DDT disturbs calcium metabolism in birds leading to thinning of eggshells and its premature breaking. It also leads to a significant decrease in their population.
So, the correct answer is option D, all the above.

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