A) bacterial overgrowth database
B) biological oxygen demand
C) biological and organic diversity
D) none of the above.
Correct Answer: B
Solution :
: Strength of sewage or degree of water pollution is measured in terms of BOD (biological oxygen demand) value. BOD may be defined as, number of miligrams of\[{{O}_{2}}\]required for decomposition of one litre of waste or water by decomposing micro-organisms (bacteria). If BOD is below 1500 mg/litre, it indicates weak sewage or less pollution, if it is 1500 - 4000 mg/litre it indicates medium sewage or medium pollution and above this value it indicates strong sewage or high pollution.
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