Which of the following is involved in nitrogen fixation in leguminous plants?
Rhizobium
Rhizobium is present in the root nodules of leguminous plants like beans and peas. Rhizobium takes nitrogen from atmosphere and fixes it in the soil so that the roots of plant can absorb it. In return, the plant provides shelter and nutrition to the Rhizobium. They fulfill the needs of each other and this relationship is known as symbiosis.