Q. Every $CO_{2}$ molecule entering the Calvin cycle needs
A) 2 molecule of NADPH and 3 molecule of ATP for its fixation
B) 2 molecule of NADPH and 2 molecule of ATP for its fixation
C) Variable amount of ATP
D) Only NADPH
Explanation
For every $CO_{2}$ molecule entering the Calvin cycle, 3 molecule of ATP and 2 molecule of NADPH are required. The difference in the number of ATP and NADPH used in dark reaction is overcome by cyclic phosphorylation
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.