Q. 164.5( 2 Votes )
DDT content in th
A toxic substance accumulated by an organism can’t be metabolised or excreted, and is thus passed on to the next higher trophic level. This is why the concentration of DDT keeps on increasing at successive trophic levels.
High concentrations of DDT disturb the calcium metabolism in birds. This causes thinning of egg shells and their premature breaking and eventually decline in the bird population.
The process of increase in the concentration of the toxicant at successive trophic levels is called biomagnifications.
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