A) industrial wastes poured into water bodies
B) extent to which water is polluted with organic compound
C) amount of carbon mono-oxide inseparably combined with haemoglobin
D) amount of oxygen needed by green plants during night
Correct Answer: B
Solution :
Biological Oxygen Demand (BOD) is a measure of pollution organic matter present in a sample of water. BOD is higher in polluted sewage water and is connected with both microbes and organic matter. When lower amount of sewage is dumped into water, the BOD will increase.
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