Question

Which genus of nitrogen-fixing bacteria forms a symbiotic relationship with the roots of leguminous plants, residing within specialised root nodules where it converts atmospheric nitrogen into a form usable by the host plant?

Q: Answer-Which genus of nitrogen-fixing bacteria forms a symbiotic relationship with the roots of leguminous...

Explanation Rhizobium is a genus of nitrogen-fixing bacteria that forms a symbiotic relationship specifically with the roots of leguminous plants, residing within specialised root nodules where it converts atmospheric nitrogen N2 into ammonia, a form usable by the host plant, in exchange for carbohydrates from the plant, distinguishing it from free-living nitrogen fixers such as Azotobacter and Azospirillum.