Describe two force that enable water to move up the xylem vessels in a continuous column.
- Water molecules are held together by cohesive force, loss of water from the leaves by transpiration exerts a tension or pull (transpiration pull) on the water in the xylem vessels. This pull is transmitted down from the petiole of the stem and finally to the roots, leading to continuous upward movement of water.
- Absorption of water by root hairs into the xylem vessels creates hydrostatic force (root pressure) that pushes water up a tall tree.
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