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(C) Domestic sewage is rich in organic waste,which acts as a nutrient source for algae and bacteria. $1$. The excessive growth of algae,known as algal

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Mortality of fish due to lack of oxygen.

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(C) Domestic sewage is rich in organic waste,which acts as a nutrient source for algae and bacteria. $1$. The excessive growth of algae,known as algal bloom,occurs due to the high nutrient content (eutrophication). $2$. As these algae die,decomposers (bacteria) consume the dissolved oxygen in the water to break down the organic matter. $3$. This leads to a severe depletion of dissolved oxygen $(DO)$ in the water body. $4$. Consequently,aquatic organisms like fish die due to asphyxiation (lack of oxygen).

$A$ lake,which receives domestic sewage rich in organic waste,may result in:

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