Question : What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium? What is their role in N_2 fixation?

Question : What are the conditions necessary for fixation of atmospher

1.	Question : What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium? What is their role in N_2 fixation?
Answer» Solution :There should be NITROGENASE enzyme in Rhizobium to fix atmospheric nitrogen by Rhizobium. Root NODULES contain an oxygen scavenger called leg hemoglobin. The enzyme nitrogenase is highly sensitive to the MOLECULAR oxygen. It requires an aerobic conditions. The nodules have adaptations that ensure that the enzyme is protected from oxygen. To protect these enzymes, the NODULE contains an oxygen scavenger called leg hemoglobin. Thus leg hemoglobin protects nitrogen from adverse effects of oxygen, takes part in nitrogen fixation and synthesis of ammonia becomes possible by nitrogenase.