Q.

Root nodules in Alnus are due to association with

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a

Rhizobium

b

Azospirillum

c

Frankia

d

Clostridium

answer is C.

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Detailed Solution

Frankia produces nitrogen-fixing nodules on the roots of non-leguminous plants, e.g., Alnus. Frankia is free-living in soil, but as symbionts, can fix atmospheric nitrogen.

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Root nodules in Alnus are due to association with