Starch is a storage form of glucose that is produced during photosynthesis. In the green areas of the leaf, photosynthesis takes place because chlorophyll is present, which is responsible for capturing light energy needed for photosynthesis. The chlorophyll absorbs the light and converts it into chemical energy, which is then used to combine carbon dioxide and water to produce glucose. This glucose is stored as starch in the chloroplasts of the leaf cells. Since the green areas of the leaf contain chlorophyll and are actively photosynthesizing, starch is only present in these areas of the leaf during the experiment.
