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Question

Biochemical oxygen demand in a river water

A
has no relationship with concentration of oxygen in the water
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B
gives a measure of the Salmonella in the water
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C
increases when sewage gets mixed in the water
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D
remains unchanged in the presence of algal bloom
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Solution

The correct option is C increases when sewage gets mixed in the water
Biochemical oxygen demand (BOD) is a measure of the amount of oxygen required/consumed to remove waste organic matter from one liter of water by aerobic bacteria using the process of decomposition.

Hence, the biochemical oxygen demand in a river water increases when sewage gets mixed in the water.

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