In a polluted lake,the index of pollution is

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(A) The index of pollution in a water body is determined by the presence or absence of bioindicator species.$Daphnia$ (water fleas) are highly sensiti

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Daphnia

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(A) The index of pollution in a water body is determined by the presence or absence of bioindicator species.$Daphnia$ (water fleas) are highly sensitive to changes in water quality,particularly to pollutants like heavy metals and pesticides.When a lake becomes polluted,these sensitive organisms disappear,making them excellent biological indicators of water pollution.Therefore,$Daphnia$ serves as an index of pollution.

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