A higher biochemical oxygen demand in a particular segment of a river indicates that

The segment is free from pollution

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The segment is highly polluted

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Aquatic life has started flourishing

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The river has high number of aquatic animals

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Solution

The correct option is B The segment is highly polluted
Biochemical oxygen demand or BOD is the oxygen required microbial decomposition of a unit mass of organic remains. The degree of impurity of water due to organic matter is measured in terms of BOD. A higher BOD of a river indicates that water is highly polluted.

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Biochemical oxygen demand is a measure of organic material present in water. BOD value less than 5ppm indicates a water sample to be ___________.

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