Dumping of large quantities of biodegradable pollutants in a stream leads to the undesirable growth of microorganisms and plankton. This phenomenon is called ___.

Oligotrophication

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Eutrophication

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BOD

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Oxygen depletion

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Solution

The correct option is B
Eutrophication

Eutrophication is a biological phenomenon of excessive richness of nutrients in a lake or other body of water, due to frequent run-offs from the land, which causes a dense growth of plant life. Biodegradable pollutants include nutrients that can be broken down by the aerobic bacteria or photosynthetic algae in water which leads to a rapid growth of microscopic algae or cyanobacteria in water, commonly known as algal blooms in water bodies.

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