show that sunlight is necessary for photosynthesis
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The ethyl alcohol breaks the chlorophyll in the leaves and makes them white in color, and iodine turns the starch into a blue-black color. ... - So starch is produced only in the leaves which are exposed to sunlight, and this proves that sunlight is very essential for plants to do photosynthesis.
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Sunlight provides the energy needed for photosynthesis to take place. In this process carbon dioxide and water are converted into oxygen (a waste product that is released back into the air) and glucose (the source of energy for the plant).
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