In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given.Assertion (A): If BOD level of water in a reservoir is less than 5 ppm it is highly polluted. Reason (R): High biological oxygen demand means low activity of bacteria in water.

Both A and R are correct but R is not the correct explanation of A.

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Both A and R are correct and R is the correct explanation of A.

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A is not correct but R is correct.

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Both A and R are not correct.

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Solution

The correct option is D Both A and R are not correct.
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 (BOD). If the BOD of water is less than 5 ppm, it is clean. If BOD increases, water pollution increases.

High biological oxygen demand means the high activity of bacteria in water.

Both A and R are incorrect.

Hence, option (C) is the correct answer.

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