A non-legume, symbiotic nitrogen fixing bacterium is

Rhizobium

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Azotobacter

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Frankia

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Clostridium

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Solution

The correct option is C Frankia
Atmospheric nitrogen is not available for plants. However, nitrogen-fixing bacteria convert atmospheric nitrogen into ammonia and make it available to plants. Azotobacter is a free-living nitrogen-fixing bacterium. Rhizobium is a symbiotic nitrogen-fixing bacterium. It fixes atmospheric nitrogen with symbiotic association with legume plants. Frankia is a non-legume symbiotic nitrogen-fixing bacterium. Clostridium is free-living anaerobic nitrogen-fixing bacterium.
Thus, the correct answer is 'Frankia.'

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