Which microbe forms nitrogen-fixing nodules on the roots of the non-leguminous plant Alnus?
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Correct answer: Frankia
Frankia is a free-living actinomycete in the soil that can form symbiotic nitrogen-fixing nodules in non-leguminous plants like Alnus. Both Rhizobium and Frankia are free-living in soil but fix nitrogen only as symbionts.
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