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 are harmful, as they are responsible for the depletion of oxygen in water bodies.
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