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Which of the following is the main source for eutrophication of surface water?

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Which of the following is the main source for eutrophication of surface water?

(a) Nitrogen

(b) Calcium

(c) Magnesium

(d) Potassium

The question was posed to me in quiz.

My doubt is from Biological Treatment of Waste Water topic in section Biological Treatment of Waste Water of Environmental Biotechnology

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Right answer is (a) Nitrogen

The explanation: Nitrogen and phosphorus is majorly responsible for Eutrophication which leads to overgrowth of plants and algae in aquatic ecosystems, after the death of the organisms die, bacterial degradation requires a lot of oxygen consumption leading to hypoxia, Calcium, potassium and magnesium are the basic nutrients and minerals available in the environment not leading to eutrophication.

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