I believe the best answers are 400-450 nm and 670 -680 nm. Photosynthesis is the process in which green plants make their own food by using energy from sunlight in organelles called chloroplasts. Chlorophyll absorb light used in photosynthesis. In this process the sun's energy is converted to chemical energy by the photosynthetic organisms. Absorption spectrum of chlorophyll includes wavelengths of blue and orange-red light, as is indicated by their peaks around 450-475 nm and around 650-675 nm
