(D) $Frankia$ is a genus of bacteria that is capable of nitrogen fixation. It exists as a free-living organism in the soil. However,it also forms symb

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(D) $Frankia$ is a genus of bacteria that is capable of nitrogen fixation. It exists as a free-living organism in the soil. However,it also forms symbiotic associations with the root nodules of several non-leguminous plants (such as $Alnus$). In these symbiotic associations,it effectively fixes atmospheric nitrogen.