(a) What depletes ozone in the stratosphere? How does this affect human life?
(b) Explain biomagnification of DDT in an aquatic food chain. How does it affect the bird population?
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A) Ozone depletion affects the human life by causing eye diseases, skin cancer and some times mutation. b) Biomagnification is the process of transfer of the chemical toxic substance in increasing concentration in successive trophic level. DDT is the best example of biomagnification in an aquatic food chain.
B) It is present in low amount in water and reaches a high concentration in fish-eating birds through biomagnification. Very high concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations
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