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DDT as an Example of Biomagnification

Fish-eating b...

Question

(a) What is the term used to describe the process shown above?
(b) What is the effect of DDT accumulation in birds?
(c) Mention one metal which also undergoes the above phenomenon. [1+1+1]

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Solution

(a) The process above shown is biomagnification. [1]

(b) High concentrations of DDT disturb calcium metabolism in birds which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations. [1]

(c) Mercury is a metal which undergoes biomagnification. [1]

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(iv) DDT accumulation is a major cause of a reduced population of fish-eating birds.
(v) Biomagnification occurs only in the aquatic food chain

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\to

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DDT as an Example of Biomagnification

Standard XII Biology

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