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Question

Members of which algal class impart red colour to red sea?

A
Cyanophyceae
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B
Rhodophyceae
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C
Phaeophyceae
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D
Bacillariophyceae
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Solution

The correct option is B Cyanophyceae
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 cyanophyceae called Trichodesmium erythraeum. This cyanophyceae imparts red colour to red sea. This results in the algal bloom or red bloom.
Thus, the correct answer is 'Cyanophyceae.'

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