Nitrogen fixation occurs in nodules on legume roots. Which of the Nitrogen fixer is involved in symbiotic association with legumes forming 'root nodules shown in the above figure?

Explanation

Rhizobium : The symbiotic relationship between soil bacteria, collectively known as rhizobia (which includes the genera Rhizobium, Bradyrhizobium, Mesorhizobium, and Sinorhizobium), and legume roots, generates nodules (a new differentiated organ), which fix atmospheric dinitrogen (N.) through the action of the nitrogenase enzyme.