Question

How do the light reactions help the Calvin cycle?

a. they break down macromolecules
b. they create hydrogen ions
c. they provide energy carriers
d. they provide photons

Answer 1

Answer: c. They provide the energy carriers

Explanation: Light energy (photons) drive this overall reaction:

2H2O + 2NADP +3ADP + 3Pi —-> 2NADPH + 3ATP + O2 + 2H+

and the ATP provides the energy for the light-independent Calvin Cycle, which also uses NADPH from the light-dependent reactions.