Some plants have nitrogen-fixing bacteria in their root nodules. What are these bacteria called?

Rhizobium

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Azotobacter

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Nitrosomonas

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Blue green algae

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Solution

The correct option is A Rhizobium
Leguminous plants like pea have nitrogen-fixing bacteria called Rhizobium in their root nodules. Rhizobium helps in converting atmospheric nitrogen into ammonia that can be utilized by the pea plant for its nutrition. Other bacteria like Nitrosomonas and Azotobacter are free-living soil bacteria that also help in nitrogen fixation.

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