The value of dissolved oxygen in polluted water is:

> 4

ppm

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< 4

ppm

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= 4

ppm

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= 6

ppm

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Solution

The correct option is A $> 4$ ppm
The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand.

Clean water has less than 5 ppm BOD value, whereas, highly polluted water has a BOD value of 17 ppm or more.

Thus, the correct answer is option A.

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