Which of the following microbes produces nitrogen fixing nodules in non leguminous plants?

Rhizobium

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Frankia

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Azotobacter

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Pseudomonas

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Solution

The correct option is B Frankia
Several bacteria produce small outgrowths (spherical) on the surface of legume roots, called as nodules. Rhizobium produces nitrogen fixing nodules in leguminous plants. But, Frankia also produces nitrogen-fixing nodules on the roots of non-leguminous plants (e.g. Alnus). Frankia is free-living in the soil, but can fix atmospheric nitogen as symbionts.

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