extent to which water is polluted with organic compounds
amount of carbon monoxide inseparably combined with haemoglobin
amount of oxygen needed by green plants during night.
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The Correct Option isB
Solution and Explanation
To measure water pollution, Biological Oxygen Demand or BOD test is done. In this test, amount of oxygen sufficient for degradation of waste organic matter by microorganisms in a sample is measured. The more oxygen used up by the microorganism to degrade the organic matter in the sample, the greater the BOD would be