KCET · BIOLOGY · STD 12 - 8. Microbes in Human Welfare

As the organic matter increases in a water body, the BOD

A increases
B decreases
C remains unchanged
D not a parameter

Verified Solution

Answer & Solution

Correct Answer

(A) increases

Step-by-step Solution

Detailed explanation

(A) increases,
BOD is the amount of oxygen that is required for biochemical decomposition of organic matter in one litre of water by bacteria. It is the amount of oxygen that is required for biochemical decomposition processes. High BOD is an indicator polluted water and low BOD is good quality water.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From KCET

Explore more questions on app