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Question

Biological Oxygen Demand (BOD) is a measure of
  1. Industrial wastes poured into water bodies.
  2. Extent to which water is polluted with organic compounds.
  3. Amount of carbon monoxide inseparably combined with haemoglobin.
  4. Amount of oxygen needed by green plants during night.

A
Extent to which water is polluted with organic compounds.
B
Amount of oxygen needed by green plants during night.
C
Industrial wastes poured into water bodies.
D
Amount of carbon monoxide inseparably combined with haemoglobin.
Solution
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Decomposition of organic matter by microbes requires oxygen. Degree of impurity of water due to organic matter is measured in terms of Biochemical oxygen demand or (BOD). BOD is the oxygen required by microorganisms to completely metabolise organic wastes present in water.

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