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Question

Which of the following is free-living bacteria responsible for nitrogen fixation

A
Pseudomonas
B
Rhodospirillum
C
Azotobacter
D
All of these
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Solution
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Correct option is D. All of these
Nitrogen-fixing microorganisms are recognized: free-living (non-symbiotic) bacteria, including the cyanobacteria. Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium and mutualistic bacteria such as Rhizobium, associated with leguminous plants.
So, the correct option is 'All of these'.

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