Which is not a free living nitrogen fixing bacterium?

Azotobacter

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Rhizobium

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Bacillus

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Rhodospirillum

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Solution

The correct option is B Rhizobium
Nitrogen-fixing bacteria are microorganisms that are capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds which can be used by the plants).
Two kinds of nitrogen-fixing bacteria are recognized.
1. Free-living (non-symbiotic) bacteria: cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.
2. Mutualistic (symbiotic) bacteria: Rhizobium, associated with leguminous plants; Frankia, associated with certain dicotyledonous species; and certain Azospirillum species, associated with cereal grasses.
Thus, the correct answer is option (B).

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