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What is the reason for the reduction in dissolved oxygen?

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in Biology – Class 12 by (271k points)
What is the reason for the reduction in dissolved oxygen?

(a) Bio-magnification

(b) Eutrophication

(c) Extinction

(d) Pollution

The question was asked in semester exam.

I need to ask this question from Environmental Issues topic in section Environmental Issues of Biology – Class 12

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Correct option is (b) Eutrophication

Explanation: The excessive richness of nutrients (phosphorus, nitrates, and detergents) in a lake or other body of water that leads to acceleration in the growth of algae and the natural aging of the lake is known as eutrophication. Excess algal growth deoxygenates water and reduces the dissolved oxygen content.

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