Question

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

• A. Increases
• B. Decreases
• C. Remains unchanged
• D. Not a parameter

Answer 1

Answer: (A)

Increases

• BOD is Biological Oxygen Demand. It is the amount of oxygen required by microbes to break down the organic matter present in a certain volume of a sample of water.
• In polluted water, BOD is high as it contains a large number of organisms.
• High BOD values in the water of a river mean that the water is highly polluted.

Thus, the correct answer is option A.