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Question : What are algal blooms? How are they formed? Give the harmful effects of formation of algal blooms in an aquatic body.

Answer»

Solution :Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of ALGAE (free floating) CALLED algal bloom.
The harmful effects:
(i) Deterioration of water quality and IMBALANCE of water ecosystem.
(ii) Fish MORTALITY rate increases.
(III) Some bloom forming algae are extremely toxic to human beings and animals.


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