Transpiration helps in regulating the water till the shoot tips.But how does this happen against the gravitational force?

Asked by  | 27th May, 2013, 11:34: AM

Expert Answer:


Transpiration explains how water moves up the plant against gravity in tubes made of dead xylem cells without the use of a pump.

Water on the surface of spongy and palisade cells (inside the leaf) evaporates and then diffuses out of the leaf. This is called transpiration. More water is drawn out of the xylem cells inside the leaf to replace what's lost. As the xylem cells make a continuous tube from the leaf, down the stem to the roots, this acts like a drinking straw, producing a flow of water and dissolved minerals from roots to leaves.

Answered by  | 7th Jun, 2013, 10:10: AM

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