Assertion: Nostoc is a photosynthetic autotroph. Reason: Nostoc can fix atmospheric nitrogen in heterocysts.

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Both assertion and reason are true and reason is the correct explanation of assertion.

Both assertion and reason are true but reason is not the correct explanation of assertion.

Assertion is true but reason is false.

Both assertion and reason are false.

answer is B.

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Detailed Solution

Cyanobacteria have photosynthetic pigments like chlorophyll a and hence are photoautotrophs. They have heterocysts meant for nitrogen fixation.

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