Question

Assertion: If `BOD` level of water in a reservoir is less than 5 ppm it is highly pollution.
Reason: High biological oxygen demand means low activity of vacteria in water.
A. Both A and R are correct and R is the correct explanation of A
B. Both A and R are correct and R is not the correct explanation of A
C. Both A and R are not correct
D. A is not correct but R is correct

Answer 1

Correct Answer - C
Both assertion and reason are not correct.
Amount of oxygen required to breakdown the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand (BOD).
If BOD level is less than `5 "ppm"` water is almost pure. High biological oxygen demand means high activity of bacteria of water.