A) vegetative cells
B) akinetes
C) heterocysts
D) hormogonia
Correct Answer: C
Solution :
Nostoc is a cyanobacteria. Nostoc is found both in aquatic and terrestrial habit. The cells of the trichome are similar is structure but at some intervals are found slightly larger, rounded. light yellowish, thick walled cells, called as heterocysts. An enzyme nitrogenase present m the heterocyst is responsible for fixing of the nitrogen.
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