Final answer:
The light reactions in photosynthesis synthesize ATP, NADPH, and O₂ using sunlight and water.
Step-by-step explanation:
The light reactions in photosynthesis synthesize ATP, NADPH, and O₂. These reactions occur in the thylakoid membranes of the chloroplasts and require sunlight. The energy from sunlight is absorbed by chlorophyll and used to generate ATP and NADPH through two electron transport chains. Water is also used during the light reactions, and oxygen is produced as a byproduct.