When domestic sewage mixes with river water,

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(C) : When domestic sewage mixes with a water body,the microorganisms present in the sewage biodegrade the organic matter using the dissolved oxygen i

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the increased microbial activity uses up dissolved oxygen.

Vedclass · Answer

(C) : When domestic sewage mixes with a water body,the microorganisms present in the sewage biodegrade the organic matter using the dissolved oxygen in the water.This process leads to a sharp decline in the concentration of dissolved oxygen,which can cause the death of aquatic organisms like fish.As the biodegradation of the organic sewage matter is completed,the concentration of dissolved oxygen in the water gradually increases again.

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