A) biomagnification of DDT
B) eutrophication by fertilisers
C) excessive use of organic manures
D) faulty calcium metabolism in birds
Correct Answer: A
Solution :
Many pesticides like DDT, aldrin, etc., have their long-life in the environment. They are fat soluble and generally non-biodegradable. They get incorporated in the food chain and reach the top level organisms. This process is biomagnification. High concentrations of DDT disturbs calcium metabolism and cause thinning and breaking cf egg shells.
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