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Which of the following exhibits biomagni...

Which of the following exhibits biomagnification ? 
(A) `SO_(2)`
(B) Mercury
(C) DDT
(D) Both B and C

A

`SO_(2)`

B

Mercury

C

DDT

D

Both B and C

Text Solution

Verified by Experts

The correct Answer is:
D
Biomagnification refers to increase in concentration of the toxicant at successive trophic level. This phenomenon is well known for DDT and Hg. In an aquatic food chain concentration of DDT is 0.003 ppb (parts per billion in water but it can ultimately reach 25 ppm in fish eating birds through biomagnification. Highest DDT deposition shall occur in birds or sea gull.
High concentration of DDT disturb calcium metabolism in birds which causes: (i) Thining of egg shell. (ii) Their premature breaking of egg shell and causes death of the birds.
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