Q45Assertion & reason
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. (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.
- (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.