As mentioned by WMJusyo,
He had said all about movement of water outside of the root hair
into the xylem
(ADD on: There is another way, less well known, for water to
enter into xylem which is water can glide across the cell walls of
root hair cells into the xylem and this is not related to osmosis
whereby water had to enter into the cells by passing through the
cell membrane (University level stuff: Through aquaporins). The
giding of the water molecules through the cell wall is just called
as such as there is no entering into the cell membrane and why it
can glide is cellulose is porous and (A level stuffs: Cellulose had
some polar OH group at the Beta glucose molecule which is polar and
will attract water molecules across, oh yes, cellulose made up
plants cells and is present in a mesh form of cellulose
macrofibers). Water will glide from cell wall to cell wall and
lastly into the xylem)
Take note also xylem is never a cell as it do not have any
nucleus nor organelles.
For transport of water from xylem towards leaves, this is
debatable and the debacle is unconcluded. 3 main processes are
involved