Main cause of eutrophication is

Fluctuation of temperature

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Unusual growth of aquatic vegetation

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Enrichment of nutrients

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Abundance of microorganisms

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Solution

The correct option is D Enrichment of nutrients
Eutrophication is the process of ageing of lakes due to water pollution. When pesticides or fertilizers wiped out from agriculture field due to rain or excessive irrigation and enters into the water body. The entry of pesticide or fertilizers into the water body makes it nutrient enriched and supports algal bloom. Thus, the correct answer is 'Enrichment of nutrients'.

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