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A river with an inflow of domestic sewage rich in organic waste may result in

(a) an increased production of fish due to biodegradable nutrients

(b) death of fish due to lack of oxygen

(c) drying of the river very soon due to algal bloom

(d) increased population of aquatic food web organisms.
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Ans: (b) death of fish due to lack of oxygen.

Explanation: Eutrophication is the natural aging of lake by the nutrient enrichment of its water. Due to which excessive growth of algal bloom. There is drastic decrease in oxygen in water bodies.

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