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

Pseudomonas

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Rhodospirillum

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Azotobacter

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All of these

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Solution

The 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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