In the Legume-Rhizobium symbiosis, nitrogen fixation is carried out in nodules by:

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Nitrogen fixation in the Legume-Rhizobium symbiosis is carried out by specialized cells called bacteroids that are formed from rhizobia that have differentiated in the plant nodules. These bacteroids are capable of fixing nitrogen because they have lost their cell wall and have undergone metabolic and morphological differentiation. The absence of the cell wall allows for efficient diffusion of oxygen to the nitrogenase enzyme, which is required for nitrogen fixation.

In the Legume-Rhizobium Symbiosis, Nitrogen Fixation Is Carried Out in Nodules