Answer:
Main function of reductase and nitrogenase is to speed up the reduction process which is necessary for nitrogen fixation.
Step-by-step explanation:
Reductase contains one Fe4S4. The main function of Fe protein is to transfer electrons from ferredoxin which is a reducing agent to the nitrogenase protein while in nitrogenase consist of two α sub-units and two β sub-units. The protein present in nitrogenase enzyme helps in the binding of nitrogen molecule to the active site of the enzyme and in that way, nitrogen fixation occurs.