PROCESS by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. In this process, plants use the chlorophyll, carbon dioxide, water, sunlight and RELEASE oxygen.Some facts of photosynthesis:Leaves are green because of chlorophyll.Plants perform photosynthesis in ORGANELLES called chloroplasts.Photosynthesis is the reverse of cellular respiration.Photosynthesis MAKES the PLANET liveable.So, it becomes clear that essential constituents of photosynthesis are Carbon dioxide, water, sunlight and chlorophyll.