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When huge amount of sewage is dumped into a river, its B.O.D. will (a) slightly decrease...

When huge amount of sewage is dumped into a river, its B.O.D. will

(a) slightly decrease

(b) remain unchanged

(c) increase

(d) decrease.

Science   Biology   
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Answer #1

Answer:(c) increase

BOD is defined as the biochemical oxygen demand which is the oxygen in mg required for 5 days in 1 litre of water at 20°C for the micro-organisms to metabolize organic waste.Due to dumping of huge amount of sewage, the oxygen levels are depleted,which are reflected in terms of BOD values of water.With dumping of wastes number of microbes also increases tremendously and these also consume most of the oxygen,so BOD of the river will increase.

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