Carbon dioxide + water + light energy are the photosynthesis reactants.
Plants absorb carbon dioxide from the atmosphere via stomata, which are small openings in their leaves. Some plants have stomata on both sides of their leaves (most monocots), while others (dicots and a few monocots) only have stomata on the underside, or lower epidermis.
Plants obtain water from the soil surrounding their roots, and water travels to the leaves via the xylem, a component of the plant's vascular system. The vascular bundle contains the xylem and phloem in leaves.
The carbon dioxide and water molecules move into the cells of the mesophyll, the layer of ground tissue between the upper and lower epidermis, once inside the leaf. Photosynthesis is carried out within these cells by organelles called chloroplasts, which use carbon dioxide and water.
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