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There are in fact two methods employed in plants which assist water to travel up the stem (in the xylem vessels).

Hydrogen bonding seems to be the primary driving force water being drawn up the xylem vessels where weak bonds form between the Hydrogen and Oxygen atoms of the water molecule's. This system works in conjunction with transpirational pull- where water is lost from the leaves through transpiration, more water molecules are drawn in behind them to as replacements.

Capillary action, this is the ability of water travel up narrow tubes against the force of gravity and is due to the adhesive and cohesive interaction between the tubes and the liquid.

Note: Osmosis is not responsible for drawing water up the stems of the plants, this is only works where there are differences in water potential and where a semipermeable membrane is in place. In other words, this works to draw water into the roots, but does not play a roll in transporting it up the stem.

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Mossie Auer

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3y ago

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