Question

question 13 of 25
where does the energy come from to make nadph in the light reactions?

a. from the energy released by atp molecules
b. from the energy stored in light
c. from the potential energy of adp molecules
d. from the energy stored by the calvin cycle

Explanation:

In the light reactions of photosynthesis, light energy is absorbed by chlorophyll and other pigments. This light - energy is used to drive the electron transport chain, which ultimately leads to the production of NADPH. ATP is also produced during the light reactions (through processes like photophosphorylation), but the energy for making NADPH specifically comes from the light energy. ADP is involved in ATP synthesis (ADP + Pi → ATP), not in providing energy for NADPH production. The Calvin cycle uses NADPH (and ATP) produced in the light reactions; it does not provide energy for NADPH formation. So, the energy to make NADPH in the light reactions comes from the energy stored in light.

Answer:

B. From the energy stored in light