Question

frankia produces nitrogen-fixing nodules on the roots of ​

Answer 1

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Frankia belongs to actinomycetes in the family Frankiaceae that fix nitrogen, both under symbiotic and free-living aerobic conditions. Free-living rhizobia cannot fix nitrogen. Both form root nodules but Frankia form in actinorhizal plants and Rhizobium forms in leguminous plants. Rhizobium is aerobic.

So the correct answer is 'Are free living in soil, but as symbionts for atmospheric nitrogen fixation'.

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Answer 2

Answer:

Rhizobium produces nitrogen fixing nodules in leguminous plants. But, Frankia also produces nitrogen-fixing nodules on the roots of non-leguminous plants . Frankia is free-living in the soil, but can fix atmospheric nitogen as symbionts.

Explanation:

Frankia is free-living in the soil, but can fix atmospheric nitogen as symbionts. Several bacteria produce small outgrowths (spherical) on the surface of legume roots, called as nodules.

The nitrogen-fixing actinobacterium Frankia forms root nodules on actinorhizal plants, with members of specific Frankia taxonomic clusters nodulating plants in corresponding host infection groups.