The term "Bio-magnification" refers to the

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(D) Bio-magnification refers to the increase in concentration of non-biodegradable substances (like $DDT$ or mercury) at successive trophic levels in

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Increase in the concentration of non-degradable pollutants as they pass through food chain

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(D) Bio-magnification refers to the increase in concentration of non-biodegradable substances (like $DDT$ or mercury) at successive trophic levels in a food chain.This occurs because a toxic substance accumulated by an organism cannot be metabolized or excreted, and is thus passed on to the next higher trophic level.As a result, the concentration of the pollutant increases as it moves up the food chain, which can have harmful effects on top-level consumers.

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