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Heterocysts present in Nostoc are specialsed forA. fragmentationB. nitrogen-fixationC. symbiotic relationD. food storage

Answer» Correct Answer - B
Cynobacteria like Nostoc can fix nitrogen through a specific structure called heterocysts. They fix atmospheric `N_(2)` using niterogenase enzyme which gets inactivated in presence of oxygen. Hence, the heterocysts creates a micro anaerobic environment in them to facilitate nitrogen-fixation.


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