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The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf. Water enters the root and is transported up to the leaves through specialized plant cells known as xylem vessels.
Photosynthesis is the process plants and some algae use to convert light energy to chemical energy stored as sugar. Plants need only carbon dioxide (CO2) and water (H2O) for photosynthesis to work. This occurs in plant leaves, specifically the leaf cells' chloroplasts. Chloroplasts are full of chlorophyll, a green pigment key to photosynthesis. The energy stored during photosynthesis starts the flow of energy and carbon down the food chain.