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Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of

(a) essential minerals

(b) oxygen

(c) food

(d) light.
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Ans: (b) oxygen

Explanation: Eutrophication is the excessive growth of algae, plants and animals,due to nutrient enrichment (p. and N.). There is drastic decrease in oxygen replenishment inside water.

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