Which of the following is a non-symbiotic nitrogen fixing prokaryote?

Azotobacter

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Clostridium

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Beijerinckia

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All of these

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Solution

The correct option is D All of these
Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (non-symbiotic) bacteria, includes the cyanobacteria (or blue-green algae), Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.
Thus, the correct answers is 'All of these.'

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