Nitrogen fixation in root nodules of Alnus is brought about by

Frankia

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Azothizobium

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Bradyrhizobium

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Clostridium

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Solution

The correct option is A Frankia
Frankia is a genus of nitrogen-fixing, filamentous bacteria that live in symbiosis with actinorhizal plants but this is non-leguminous. Hence nitrogen fixation in root nodules of Alnus is brought about by Frankia.
So, the correct option is 'Frankia'

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