Question

Why are root nodules useful for the plants?

Answer 1

leguminous plants develope root nodules by the action of bacteria such as rhizobium the nodules produce a molecule  called leghaemoglobin,which is pink in colour.it acts as a carrier for nirogen molecules and helps in its fixation from atmosphere via the roots in the plant thus root nodules are important for plants to fix atm N2

Answer 2

Answer:Root nodules are useful for plants because they harbour nitrogen fixing bacteria such as Rhizobium, Bradyrhizobium, Mesorhizobium and Sinorhizobium that fixes atmospheric nitrogen which is available to the plants. Root nodules are usually formed in leguminous plants.