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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.
Experiments to show the factors required in photosynthesis (2) - light and carbon dioxide. The plant is placed in a dark place, e.g. a cupboard for 24 or 48 hours.It is essential that the plant is watered beforehand, and not forgotten about!This is so as to force the plant to use its reserve of starch, and not allow its replacement by photosynthesis. The effect of carbon dioxide. Leaves of the plant are enclosed within glass flasks, supported at an angle by stands and clamps (250/350ml wide-mouthed flasks will usually do). Each flask will contain small amounts of various liquids, which should not be allowed to touch the leaves.