Which nitrogen fixation is Symbiosis?

Explanation

The correct option is (c) Rhizobium. Rhizobium is a type of bacteria that forms a symbiotic relationship with leguminous plants. This symbiosis is a form of nitrogen fixation. The bacteria colonize the root nodules of leguminous plants, such as peas, beans, and clover, and in return, the plants provide the bacteria with sugars. The rhizobia have the ability to fix atmospheric nitrogen into a form that the plants can use for their growth.