Assertion :Cyanobacteria can do nitrogen fixation. Reason: All cyanobacteria possess heterocyst.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Cyanobacteria are also called as Blue-green algae. They are photosynthetic bacteria. Cyanobacteria like Nostoc, Anabaena, Frankia, etc can do nitrogen fixation. Heterocysts are specialized nitrogen-fixing cells formed by some filamentous cyanobacteria, such as Nostoc. They contain enzyme nitrogenase. They create microanaerobic environment.
Thus, the correct answer is 'Assertion is correct but Reason is incorrect.'

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