Question

Why is Rhizobium categorized as a 'symbiotic bacterium'? How does it act as a biofertilizer?

Answer 1

Rhizobium is the symbiotic bacterium with leguminous plants where it produces root nodules and fixes atmospheric nitrogen into an organic form.

They fix atmospheric nitrogen into an organic form which is then used by plants as nutrients. Rhizobium can be used as a biofertilizer. They fix atmospheric nitrogen into an organic form, which is used by the plants as nutrients.