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Standard XII
Biology
Question

Measurement of the rate of oxygen consumption in unit volume of water over a period of time is done to find out


  1. Biogas generation
  2. Biological oxygen demand
  3. Biosynthetic pathways
  4. Fermentation

A
Fermentation
B
Biogas generation
C
Biological oxygen demand
D
Biosynthetic pathways
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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 'Biological Oxygen Demand (BOD)'. BOD is the oxygen in milligrams required for 5 days in 1 litre of water at 20 degree centigrades for the microorganisms to metabolise organic wastes.

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