Question

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 combined with haemoglobin

(d) amount of oxygen needed by green plants during night

Answer 1

Correct option (b) extent to which water is polluted with organic compounds

Explanation :

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 micro-organism in a sample is measured. The more oxygen used up by the micro-organism to degrade the organic matter in the sample, the greater the BOD would be.