Blue-green alga that causes red bloom is

Anabaena

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Gleocapsa

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Trichodesmium

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Nostoc

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Solution

The correct option is C Trichodesmium
The red sea is the saltiest sea and connects to the ocean without any river meeting the sea. It is named so because of the abundant occurrence of red coloured planktonic cyanobacterium called Trichodesmium erythraeum. This results in the algal bloom or red bloom.
Thus, the correct answer is 'Trichodesmium.'

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