Which of the following is/are free living nitrogen fixers?

Options

AAzotobacter, Beijerinckia
BGlomus
CFrankia
DRhizobium

Correct answer

A. Azotobacter, Beijerinckia

Step-by-step solution

Azotobacter and Beijerinckia are free living nitrogen fixing bacteria. Frankia and Rhizobium are free living aerobes in soil but are unable to fix nitrogen in that state and can fix nitrogen only in symbiotic association. Glomus is an arbuscular mycorrhizal fungi fixing nitrogen in symbiotic association.

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