Question

Assertion (A) Nitrogen-fixing enzyme in legume root nodules functions at low oxygen concentration.
Reason (R) Low oxygen concentration is provided by leghaemoglobin.

• A. Both A and R are correct and R is the correct explanation of A
• B. Both A and R are correct, but R is not the correct explanation of A
• C. A is correct, but R is incorrect
• D. Both A and R are incorrect

Answer 1

The correct option is A

Both A and R are correct and R is the correct explanation of A

Nitrogen-fixing enzyme (nitrogenase) functions under anaerobic conditions. Leghaemoglobin combines with oxygen and protects nitrogenase.