Biology / Bio 2545 · Atom · ~20 seconds
Transpiration and Stomatal Regulation
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Transpiration, water vapor loss at the leaf surface, drives xylem sap ascent but is regulated by guard cells opening and closing the stomata.
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Guard cells close stomata under water stress, cutting transpiration loss but also blocking carbon dioxide needed for photosynthesis.
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Up to 90 percent of water a root absorbs exits through transpiration — most absorbed water never becomes plant tissue.