Create an aquatic food chain in a water body into which effluents flow from a pesticide factory. Diagrammatically represent biomagnification in this food chain.

Explanation

A few toxic substance often present in industrial waste waters, can undergo biological magnification in the aquatic food chain. Increase in concentration of the toxicant at successive trophic levels refers to biomagnifications . This is due to a toxic substance accumulated by organism cannot be metabolised or excreted and thus, passes on to the next higher trophic level . THis phenomenon is well know for mercury and DDT.
The figure showns biomagnification of DDT in an aquatic food chain . In this manner , the concetration of DDT is in creased at successive trophic levels . If is starts at 0.003 ppb (part per billion ) in water , it can ultimately reach 25 ppm (part per million) in fish eating birds, through biomagnification . High concentration of DDT disturbs calcium metablolism in birds, which causes thickening of egg shell and their premature breaking eventually causing decline in brids populations.