Final answer:
Photosynthetic organisms use light energy for ATP production through a process known as photophosphorylation. Light is captured by plants and used to move electrons, forming NADPH and ATP.
Step-by-step explanation:
Photosynthetic organisms use light energy for ATP production through a process known as photophosphorylation. During photosynthesis, light is captured by plants and used to move electrons, forming NADPH and ATP. These energy-rich molecules are then used to convert carbon dioxide into carbohydrates through the Calvin cycle.