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.

Assertion (A): If BOD level of water in a reservoir is less than 5 ppm

1.	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.
Answer» Both Assertion and Reason are correct and is the correct explanation of Assertion Both Assertion and Reason are correct but Reasonis not the correct explanation of Assertion Both Assertion and Reason are not correct Assertion is not correct but Reason is correct SOLUTION :Correct Assertion. If BOD level is less than 5 PPM, water is almost PURE Correct Reason. HIGH BIOLOGICAL oxygen demand means high activity of bacteria in water