Previous year MCQs

Environment & Ecology UPPSC 2007 GS-I
Question

A BOD in a water body, the excess of BOD indicates that its water is:

Answer & Solution

Answer: (Detailed Solution Below)

Option C: Is polluted with sewage

Detailed Solution:

The correct answer is “Is polluted with sewage ”.
Biochemical Oxygen Demand (BOD) is a measure of the amount of oxygen that microorganisms require to decompose organic matter in water. An excess of BOD in a water body indicates a high level of organic pollution, often due to the presence of sewage or other organic waste. This high organic load stimulates microbial activity, which in turn depletes the oxygen levels in the water, making it less habitable for aquatic life and leading to poor water quality. Therefore, a high BOD is a clear indicator that the water is polluted with organic matter, typically sewage.

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