Answer: By simple diffusion or by use of an integral transport protein
How does water enter and exit a cell?

Water can only pass through the endodermis by crossing the membrane of endodermal cells twice (once to enter and a second time to exit). Water moving into or out of the xylem which is part of the apoplast can thereby be regulated since it must enter the symplast in the endodermis.

When a plant cell is placed in a solution that is hypotonic relative to the cytoplasm water moves into the cell and the cell swells to become turgid. Osmosis is responsible for the ability of plant roots to draw water from the soil. Plants concentrate solutes in their root cells by active transport and water enters the roots by osmosis. ...

The next stage in the transpiration stream is water passing into the xylem vessels. The water either goes through the cortex cells (between the root cells and the xylem vessels) or it bypasses them – going through their cell walls. After this the water moves up the xylem vessels to the leaves through diffusion: A pressure change between the top and bottom of the vessel. Diffusion takes place … ...

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