Leaves are green due to the presence of a green coloured pigment called chlorophyll. the main function of chlorophyll is to perform photosynthesis in the presence of sunlight. Chlorophyll is located in a plant’s chloroplasts, which are tiny structures in a plant’s cells. Chlorophyll gives plants their green color because it does not absorb the green wavelengths of white light. That particular light wavelength is reflected from the plant, so it appears green.