Q.

Filamentous bacterium that helps in nitrogen fixation in root nodules of non-legumes is:

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a

Rhizobium associated with pea plant

b

Rhizobium associated with Casuarina

c

Frankia associated with Alnus

d

Frankia associated with groundnut

answer is C.

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Detailed Solution

The microbe, Frankia, also produces nitrogen-fixing nodules in the roots of non-leguminous plants (e.g., Alnus). Frankia is free-living in the soil, but as symbiont, it fixes atmospheric nitrogen.
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