A) green algae
B) blue-green algae
C) bacteria
D) Hydrilla
Correct Answer: B
Solution :
Water blooms are formed by the growth of some microscopic or semi-microscopic algae such as Anabaena, Arthrospira, Nodularia, Nostoc etc. Water blooms may be harmful because they are indirectly responsible for fish mortality due to depletion of oxygen.
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