Identify the bacteria found in root nodules of leguminous plants
The correct option is CRhizobium Root nodules are present in those plant roots which has a symbiotic association with nitrogen-fixing bacteria. This relationship is very common in nitrogen-limited conditions. A specific strain of bacteria known as rhizobia converts nitrogen gas from the atmosphere to ammonia which is then used in the formation of amino acids and nucleotides. Whereas acetobacter is a free-living nitrogen-fixing bacteria. E-coli live in the intestine and Granulobacter is associated with fermentation of pentose.