Plants take in gas through their stomata (small openings typically found on the underside of leaves), making them the site of gas exchange. Plants require both oxygen and carbon dioxide to perform their everyday chemical processes, though they use more carbon dioxide. Stomata are also important in transpiration: the evaporation of water through the leaves, which creates a pull throughout the plant’s vascular tissue, allowing water to move into the plant through the roots. This is called the transpiration stream.

Stomata can open and close by changing the amount of water in the two cells that sit on the sides of the stomatal opening. Doing so can help preserve water in the plant. [x]

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