Which one is a non-symbiotic nitrogen fixer? - Vidyadip

MCQ

Which one is a non-symbiotic nitrogen fixer?

A
Rhizobium
B
Anabaena
C
Nostoc
D
Bradyrhizobium

✓

Answer

Nostoc

Explanation:

Nostoc is a free-living (non-symbiotic) autotrophic Cyanobacteria and used as biofertilser for wetland rice and can provide 25-30 kg nitrogen/ hectare. The heterocysts are the sites of nitrogen fixation. Heterocyst formation occurs only in filamentous Cyanobacteria.

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