Final answer:
Energy carriers like NADP+/NADPH and ATP transport and store energy during photosynthesis. They transport electrons and energy in the light-dependent reactions and store energy for later use in the Calvin cycle to make sugar.
Step-by-step explanation:
The function of energy carriers like NADP+/NADPH and ATP is to transport and store energy during photosynthesis. NADP+ and ATP transport electrons and energy in the light-dependent reactions of photosynthesis. ATP carries chemical energy in the form of a phosphate group, which is used to power cellular processes. NADP+ accepts electrons and hydrogen ions to form NADPH, which stores energy for later use in the Calvin cycle to make sugar.