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GS Geography Physical Geography of World
Q.

The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as:
Explanation:

ANS. (A) 
Eutrophication is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic system. One example is the “bloom” or great increase of phytoplankton in a water body as a response to increased levels of nutrients.

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