Question

Assertion (A): Higher plants can not utilize nitrogen that is present in the form of $N_2$ in air.

Reason (R): In higher plants, the nitrogenase enzyme is absent.

• A. Both A & R are true and R explains A
• B. Both A & R are true and R does not explain A
• C. A is true and R is False
• D. Both A & R false

Answer 1

The correct option is A

Both A & R are true and R explains A

Nitrogenase can only break N ≅ N bond and it is absent in higher plants, hence they cannot utilize $N_2$ present in the air.