NEET Questions Solved

AIIMS - 2003

Biological Oxygen Demand (BOD) is a measure of
(a) industrial wastes poured into water bodies
(b) extent to which water is polluted with organic compounds 
(c) amount of carbon monoxide inseparably
(d) amount of oxygen needed by green plants during night.

(b): To measure water pollution, Biological Oxygen Demand or BOD test is made. In this test, amount of oxygen sufficient to degrade waste organic matter by bacteria in a sample is measured. The more oxygen used up by the bacteria to degrade the organic matter in the sample, the greater the BOD would be.

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