Chain of water molecule – evaporating at one end.
The evaporating molecule must move up, with an upward drag. To make the drag more efficient it will be good idea to make a vacuum tube. But even vacuum tube has a limit because after reaching certain height two opposing process gravity and transpiration-drag will reach equilibrium. Solution is adhesion of water molecule to xylem vessel, transferring weight of the water column to the tree itself. Now we have got rid of gravity.
What we'll do when gas bubbles breaks the chain. Answer is make new fibre. Simple!
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