Leaves Photosynthesis, Transpiration, Respiration, Classification Tools A B green plants use sunlight to make food photosynthesis evaporation of water through stomata transpiration breaking down of food to release energy respiration using characteristics of leaves to identify plants classification reactants of photosynthesis carbon dioxide, water products of photosynthesis glucose, oxygen cell structure photosynthesis occurs chloroplasts molecules of carbon dioxide used in photosynthesis six molecules of water used in photosynthesis six molecules of glucose made in photosynthesis one molecules of oxygen made in photosynthesis six stores energy photosynthesis releases energy respiration needed in cells for photosynthesis chlorophyll atoms of oxygen in one molecule of carbon dioxide two atoms of carbon in six molecules of carbon dioxide six reactants of respiration oxygen, glucose products of respiration water, carbon dioxide molecules of oxygen used in respiration six molecules of glucose used in respiration one molecules of carbon dioxide made in respiration six molecules of water made in respiration six cell structure respiration occurs mitochondria cells respiration occurs all cells of all organisms all the time atoms of carbon in one molecule of glucose six atoms of oxygen in six molecules of oxygen twelve leaf with one blade simple leaf with more than one leaflet compound attaches leaf to stem petiole may be smooth, toothed, or lobed margin veins side by side parallel one main vein in middle pinnate several main veins branch from petiole palmate all leaflets attached at petiole palmately compound all leaflets not attached at petiole pinnately compound