NEET Botany Biological Classification Questions Solved

Heterocysts present in Nostoc is specialised for

(1) fragmentation

(2) nitrogen-fixation

(3) symbiotic relation

(4) food storage

Audio Explanation:

(2) Cynobacteria like Nostoc can fix nitrogen through a specific structure called heterocysts. They fix atmospheric N2 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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