Select the correct statement regarding heterocysts.

These are present in some filamentous cyanobacteria such as Nostoc and Anabaena

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These cells are specialized to perform

N_{2}

-fixation

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These cells contain enzyme nitrogenase

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All of these

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Solution

The correct option is A All of these
Heterocysts are 'H' shaped structures present in certain specialized cells of filamentous Cyanobacteria like Nostoc, Anabaena, etc. The heterocysts provide an anaerobic environment for enzyme nitrogenase as nitrogenase is inactivated in the presence of oxygen.
So, the correct answer is option D.

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