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(A) Decomposition of organic matter by microbes requires oxygen. Degree of impurities of water due to organic matter is measured in terms of 'Biologic

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(A) Decomposition of organic matter by microbes requires oxygen. Degree of impurities of water due to organic matter is measured in terms of 'Biological Oxygen Demand' $(BOD)$. $BOD$ is the oxygen required by microorganisms to metabolise organic wastes. When sewage is dumped into a river,the amount of organic matter increases,which leads to an increase in the $BOD$ value as more oxygen is consumed by microorganisms for decomposition.

When a huge amount of sewage is dumped into a river,the $BOD$ will

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