Whoever asked the xylem thingi question im gonna xplain in my own words
Imagine sipping juice through a straw. The straw is really thin so the water rises through it easily-imagine sippin the juice through a pipe. Its hard ryt? So that’s pretty much capillary action, which is weak - u see xylem vessels r thin so water rises up against gravity easily.
Now in the root cells, thers pressure due 2 accumulation of water. This forces water out of one cell and into the other so they reach the xylem vessels. That’s root pressure or turger pressure but its also a weak pressure. Now @ th top, in the leaves, water is being lost due 2 transpiration. They are fewer water particles up here and more down the xylem vessels so as u no in osmosis water particles move from a region of high water potential to lower water potential n the water potential gradient is created due 2 all these thingis.Voila!water moves up :p
Hope u understand
n By the way i dunno tht hydrogen ions thingi cn u xplain more pls?