Trichodesmium erythraeum which gives colour to Red Sea is a

Green alga

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Blue-green alga

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Red alga

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Brown alga

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Solution

The correct option is D Blue-green alga
Rea sea is located between the East African coast and the Saudi Arabian peninsula. It 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 blue green algae called Trichodesmium erythraeum.
Thus, the correct answer is 'Blue-green algae.'

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