(a) The total amount of oxygen
consumed by micro-organisms (bacteria) in decomposing organic matter present in
certain volume of a sample of water is called Biochemical Oxygen Demand
(BOD) of the water.
Water considered to be pure if
it has BOD less than 5 ppm whereas highly polluted water has BOD more than 17
ppm. Thus, the water having BOD less than 5 ppm is rich in dissolved oxygen.
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