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 a low activity of bacteria in water.

(i) Both A and R are correct and R is the correct explanation of A.

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

(iii) Both A and R are not correct.

(iv) A is not correct but R is correct.

 

Answers (1)

The answer is the option (iii) Both A and R are not correct.

Explanation: BOD is a measure of the amount of organic material present in water, in terms of how much oxygen it requires to break it down biologically. If the water has a value of BOD less than 5 ppm, it is considered as clean water; however, water pollution increases if the BOD increases.

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