A) The amount of \[{{O}_{2}}\] utilized by organisms in water
B) The amount of \[{{O}_{2}}\] utilized by micro-organisms for decomposition
C) The total amount of \[{{O}_{2}}\] present in water
D) All of the above.
Correct Answer: B
Solution :
Strength of sewage or degree of water pollution is measured in terms of BOD (Biochemical Oxygen Demand) value. BOD may be defined as, 'number of milligrams of \[{{O}_{2}}\] required for decomposition of one litre of waste or water by decomposing microorganisms (bacteria)'.
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