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Question

Occurrence of water blooms in a lake indicates

A
Excessive nutrient availability
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B
Nutrient defciency
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C
Oxygen defciency
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D
Absence of herbivores
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Solution

The correct option is A Excessive nutrient availability
The presence of large amounts of nutrients in waters causes excessive growth of planktonic (free-floating) algae, called as an algal bloom, which imparts a distinct colour to the water bodies. Algal blooms cause deterioration of the water quality and fish mortality. Some bloom-forming algae are extremely toxic to human beings and animals.

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