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 measures the rate of uptake of oxygen by micro-organisms in a sample of water, indicating the amount of organic matter present. 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.