In Aulosira, Tolypothrix and Nostoc, ............ are the sites for nitrogen fixation.

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Heterocysts

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Solution

The correct option is B Heterocysts
Heterocyst is transparent thick walled empty cell which is present in intermittent position in filaments of blue green algae. They are the site of nitrogen fixation. Aulosira, Tolypothrix and Nostoc are the blue green algae wherein heterocyst serves as site for nitrogen fixation. Correct answer is D.

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