What is the function of heterocysts?

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(A) Heterocysts are specialized,thick-walled cells found in certain filamentous cyanobacteria like $Nostoc$ and $Anabaena$. Their primary function is

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Fixation of atmospheric $N_2$

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(A) Heterocysts are specialized,thick-walled cells found in certain filamentous cyanobacteria like $Nostoc$ and $Anabaena$. Their primary function is the fixation of atmospheric nitrogen $(N_2)$ into ammonia,which is essential for the organism's growth. They provide an anaerobic environment necessary for the activity of the enzyme nitrogenase,which is sensitive to oxygen.

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