Multiple choice Which bacterium is present in the root nodules of the leguminous plants? Lactobacillus Rhizobium Clostridium Streptococci Reveal answer Fill a bubble to check yourself B Correct answer Explanation Rhizobium is the nitrogen fixing bacteria present in the root nodules of leguminous plants. This bacteria lives in symbiotic relation with the plants, gets shelter from plant and in return provides usable form of nitrogen to it.