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Water enters roots, moves through xylem, and reaches leaves. The main upward pull comes from transpiration: water evaporating from leaves creates tension that draws a continuous water column upward (cohesion–tension idea).

Root pressure can contribute, especially at night, but for tall plants the transpiration pull dominates during the day.

Biology tuition in Korang Town Islamabad can use a cut celery stalk in coloured water to show pathways visually.