Question
Arrange the following options in ascending order of their BOD value:
(I) Sample of highly polluted pond water
(II) Sample of unpolluted pond water
(III) Distilled water
(I) Sample of highly polluted pond water
(II) Sample of unpolluted pond water
(III) Distilled water
Answer: Option C
:
C
Biochemical Oxygen Demand is a measure of the quantity of oxygen used by microorganisms (e.g., aerobic bacteria) in the oxidation of organic matter. The higher the degree of pollution, greater would be the requirement of oxygen by microorganisms for decomposition. Therefore, highly polluted water has maximum BOD and distilled water has least BOD, as the latter does not contain microorganisms.
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:
C
Biochemical Oxygen Demand is a measure of the quantity of oxygen used by microorganisms (e.g., aerobic bacteria) in the oxidation of organic matter. The higher the degree of pollution, greater would be the requirement of oxygen by microorganisms for decomposition. Therefore, highly polluted water has maximum BOD and distilled water has least BOD, as the latter does not contain microorganisms.
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