Question

What is the ratio of ATP requirement for the fixation of 1 molecules of $C{O}_2$ in sugarcane and 1 molecules of $N_2$ in bean?

• A. 3:16
• B. 5:8
• C. 3:8
• D. 5:16

Answer 1

The correct option is A 3:16

Fixation of 1 molecule of CO${}_2$ in sugarcane requires 3 ATP and 2 NADH.
Fixation of 1 molecule of N${}_2$ in beans requires 16 ATP molecules.

Thus, the ratio is 3:16.

Therefore, the correct answer is option A.