Water enters the roots by diffusion and osmosis since the solution in the vacuole is more concentrated than the surrounding water. Mineral salt are absorb by active transport.
This process help water to move from cell to cell, through the roots and upward to the steam to the xylem vessels.
These setup a root pressure(capillarity and transpiration pull wich causes water to move upward to higher branches and leaves.
A section falls or pressure is create by contant evaporation of water to the stomata of the leaf.
Roots pressure and sanction pressure are two important forces which contribute greatly to the upward movement of water in the xylem vessels.
Transpiration pull is assisted by force of cohesion
