Botany - Mineral Nutrition Question with Solution | TestHub

There is swelling is found in the roots of leguminous plants and that is known as root nodule. Root nodules contain bacteria of the genus Rhizobium that helps in nitrogen fixation and they show symbiosis with legumes. These bacteria generally live in the soil and enter the plant and start living in the cortex. They convert atmospheric nitrogen to ammonia. So the correct answer is B.