Question

How the bacteria present in soil and root nodules of leguminous plants are useful?

Answer 1

Nitrogen is the most commonly limiting nutrient in plants. Legumes use nitrogen fixing bacteria, specifically symbiotic rhizobia bacteria, within their root nodules to counter the limitation. Rhizobia bacteria fix nitrogen which is then converted to ammonia.

Answer 2

Actually the bacteria protects the roots of leguminous plants from the corrosive action of soil and it also provide more simpler substances so that they will be utilized by plants