Q. The synthesis of one molecule of glucose during Calvin cycle requires
A) 12 molecules of ATP and 18 molecules of $NADPH_{2}$
B) 6 molecules of ATP and 12 molecules of $NADPH_{2}$
C) 18 molecules of ATP and 12 molecules of $NADPH_{2}$
D) 12 molecules each of ATP and $NADPH_{2}$
Explanation
Assimilation and reduction of carbon dioxide takes place during Calvin cycle. This cycle takes in only one carbon (as $CO_{2}$) at a time so it takes six turns to produce a hexose or glucose molecule (6 carbon). In Calvin cycle, for formation of one mole of hexose sugar (glucose) 18 ATP and 12 $NADPH_{2}$ are used. The assimilatory power ($NADPH_{2}$ and ATP) are generated in light reaction of photosynrthesis.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.