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Q.

High value of BOD (Biochemical Oxygen Demand) indicates that

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a

water is less polluted

b

consumption of organic matter in the water is higher by the microbes

c

water is pure

d

water is highly polluted.

answer is D.

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Detailed Solution

High value of BOD (Biochemical Oxygen Demand) indicates that water is highly polluted with organic pollutants.

The more organic matter there is (e.g., in sewage and polluted bodies of water), the greater the BOD; and the greater the BOD, the lower the amount of dissolved oxygen available for higher animals such as fishes. The BOD is therefore a reliable gauge of the organic pollution of a body of water.

Microbes do not consume but decompose organic matter.

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