Which one is a non-symbiotic nitrogen fixer?

Rhizobium

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Anabaena

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Nostoc

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Bradyrhizobium

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Solution

The correct option is B Nostoc
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.
So, the correct answer is option C.

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