In a polluted lake,the index of pollution is

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(A) The index of pollution in a water body is primarily determined by the $BOD$ (Biochemical Oxygen Demand) and the presence of specific bioindicator

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$BOD$ and Daphnia

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(A) The index of pollution in a water body is primarily determined by the $BOD$ (Biochemical Oxygen Demand) and the presence of specific bioindicator organisms. $BOD$ measures the amount of dissolved oxygen required by aerobic microorganisms to decompose organic matter in water; higher $BOD$ indicates higher pollution. $Daphnia$ (water fleas) are sensitive to water quality and are widely used as bioindicators to assess the level of pollution in aquatic ecosystems. Therefore,$BOD$ and $Daphnia$ serve as reliable indicators of pollution.

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