Biochemical oxygen demand (BOD) in river water:

Remains unchanged when algal bloom occurs.

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Gives a measure of Salmonella in the water.

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Increases, when sewage gets mixed with river water.

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Has no relationship with concentration of oxygen in the water.

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Solution

The correct option is C Increases, when sewage gets mixed with river water.
Biochemical Oxygen Demand (BOD) is the amount of dissolved oxygen required for oxidation of microbes in a unit volume of water. BOD is an index to measure the pollution load in water. Higher the BOD and lower is the dissolved oxygen (DO) is when sewage is dumped in water.

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