Biological Classification Question 21
21. Specialized cells for fixing atmospheric nitrogen in Nostoc are
[NEET Kar. 2013]
(a) Akinetes
(b) Heterocysts
(c) Hormogonia
(d) Nodules
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Answer : b
Hints & Solutions
(b) Heterocysts are large sized, thick-walled specialised cells which occur in terminal, intercalary or lateral position in filamentous cyanobacteria, e.g., Nostoc. They have enzyme nitrogenase and are specialised to perform biological nitrogen fixation.
