If we continuously add sewage water into a ri | vedclass

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(B) Sewage water is rich in organic matter,which serves as a food source for microorganisms like bacteria.As more sewage is added to the river,the pop

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Increase continuously

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(B) Sewage water is rich in organic matter,which serves as a food source for microorganisms like bacteria.As more sewage is added to the river,the population of these microorganisms increases to decompose the organic matter.These microorganisms consume a large amount of dissolved oxygen during the decomposition process.$BOD$ (Biochemical Oxygen Demand) is defined as the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria.Therefore,as the amount of organic waste (sewage) increases,the $BOD$ of the river increases continuously.

If we continuously add sewage water into a river,the $BOD$ of the river will:

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