Which of the following is not an aerobic nitrogen fixing free living bacteria?

Azospirillum

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Azotobacter

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Beijerinickia

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Chromatium

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Solution

The correct option is D Chromatium
Azospirillium is Gram-negative, aerobic nitrogen-fixing bacteria.
Azotobacter is aerobic and free-living nitrogen-fixing bacteria.
Beijerinckia is a free-living aerobic nitrogen-fixing organism.
Chromatium is gram-negative bacteria found in water which is anaerobic nitrogen fixer.
So, the correct answer to this question is 'Chromatium'.

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