Biology · MICROBES IN HUMAN WELFARE

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The greater the BOD of waste water, more is its polluting potential. Reason (R): BOD refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidised by bacteria. In the light of the above statements, choose the correct answer from the options given below:

1. A
   Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B
   Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
3. C
   Statement (A) is true but (R) is false.
4. D
   Statement (A) is false but (R) is true.