xylem
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- Xylem
- Water
- The cells around the xylem vessels in the root uses active transport to absorb mineral salts up a concentration gradient into the plant. This lowers the water potential in the xylem vessels. Water, therefore, passes from the living cells into the xylem vessels by osmosis and flows upwards
- Phloem
- sucrose from companion cell
- Water tends to move up inside very narrow tubes due to the interactions between water molecules and the surfaces of the the tube. If the tube is sufficiently small, then the combination of surface tension (which is caused by cohesion within the liquid) and adhesive forces between the liquid and container wall act to propel the liquid.
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