Solution: The major photosynthetic pigment chlorophyll a, as well as accessory pigments such as chlorophyll b, chlorophyll c, and carotenoids, trap sunlight to carry out photosynthesis’ light processes. The light reactions of photosynthesis produce ATP and NADPH, which are used to power the second phase of photosynthesis (dark reactions), which is when carbohydrate synthesis occurs. ATP and NADPH are formed during the light reaction of photosynthesis.