Which of the following causes biomagnification ?

Options

A. `SO_2`
B. Mercury
C. DDT
D. Both (b) and (c)

Answer

D

Explanation

Biomagnifications refers to increase in concentration of toxicant to the successive tropic level. This phenomenon is well known for DDT and mercury. In an aquatic food chain of DDT is 0.003 ppb (parts per billion) in water but it can ultimately reaches 25 ppm in fish eating birds through biomagnifications. Highest DDT deposition shall occur in birds or sea gull. High concentration of DDT disturb calcium metabolism in birds.