Question

Question #0fac6

Answer 1

• The DDT in fish eating bird is calculated as :

Explanation:

• Biomagnification is refer to the increase in concentration of the toxicant substances present in industrial waste waters at successive trophic level in aquatic food chain.

• Because when a toxic substance accumulated by an organism at lower trophic level , it cannot be metabolised or excreted and is passed on to the next higher trophic levels of the food chain.

• Hence , the concentration of DDT goes on increasing as passed to higher trophic level.

• The higher concentration of DDT disturbs:

• Calcium metabolism in birds

• Thinning of eggshell

• Premature breaking

• Decline in bird population