Rise of water through narrow xylem vessel due to surface tension
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Water tends to move up inside very narrow tubes due to the interactions between water molecules and the surfaces of the the tube. ... This negative pressure on the water pulls the entire column of water in the xylem vessel. This negative pressure due to transpiration is known as "transpiration pull".
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The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw. Cohesion (water sticking to each other) causes more water molecules to fill the gap in the xylem as the top-most water is pulled toward the stomata.
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