Arrange the stages of bio magnification of DDT.

(A) Fish eating birds (PPT 25 PPm)

(B) Small fish (DDT 0.5 PPM)

(C) Zooplankton (DDT 0.04 PPm)

(D) Water (DDT 0.003 PPb)

(E) Large fish (DDT 2 PPM)

Choose the correct answer from the options given below:

(D) → (C) → (B) → (E) → (A)

The correct answer is Option (2)- (D) → (C) → (B) → (E) → (A)

A few toxic substances, often present in industrial waste waters, can undergo biological magnification (Biomagnification) in the aquatic food chain. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well- known for mercury and DDT.

In this manner, the concentration of DDT is increased at successive trophic levels; say if it starts at 0.003 ppb (ppb = parts per billion) in water, it can ultimately reach 25 ppm (ppm = parts per million) in fish-eating birds, through biomagnification.

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

 Biomagnification of DDT in an aquatic food chain .