What is setting up of water column in xylem tissue? 

Dear student,
Please find below the answer:

Xylem helps in the transportation of water and dissolved minerals from the roots of the plant to various parts like leaves, stems, etc. This is necessary for the proper functioning of the plant.
The transport of water and minerals from the root to upper parts of the plant through xylem is called ascent of sap. This can also be called setting up of water column in xylem tissue.

Hope this clears your doubt.
Regards.
 

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