Heterocysts, specialised for nitrogen fixation, occur in certain

Red algae(Batrochospemmum)

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Green algae (Spirogyra)

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Blue-green algae(Anabaena)

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Brown algae(Laminaria)

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Solution

The correct option is C Blue-green algae(Anabaena)
Anabaena is a blue green algae. It has ability to fix atmospheric nitrogen. It converts nitrogen into ammonia. The heterocysts present in it are specialized for nitrogen fixation. It contains enzyme nitrogenase. Nitrogenase is inactivated by oxygen. Hence, the heterocyst creates a microanaerobic environment.
Thus, the correct answer is 'Blue-green algae(Anabaena).'

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