Question

what is rhizobium ?​

Answer 1

Explanation:

a nitrogen-fixing bacterium that is common in the soil, especially in the root nodules of leguminous plants.

Answer 2

Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes (Fabaceae). To express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen.[1] In general, they are gram negative, motile, non-sporulating rods.