HORTICULTURE

Detailed explanation-1: -Rhizobium attaches to the roots of the leguminous plants resulting in the generation of root nodules. It forms a symbiotic association with the leguminous plants as it draws the nutrition from the plants and in turn helps with the fixation of nitrogen in the soil for the leguminous plants to take up.

Detailed explanation-2: -Rhizobium bacteria are found in the root nodules of leguminous plants such as peas and beans.

Detailed explanation-3: -These bacteria colonise the roots of the leguminous plants that in response produce a set of new organs called ‘nodules’ on their roots. It is in those nodules that the bacteria fix nitrogen and convert it into ammonia, a compound necessary for plant growth and development.

Detailed explanation-4: -The bacteria penetrate the roots and form nodules. They help in the fixation of atmospheric nitrogen by converting it into usable nitrogenous compounds. Thus, the correct answer is option C.