Water diffuses from the soil into the hair root cells by osmosis. The high concentration of Mg+ ions in the roots means that the concentration of water molecules is lower; this allows the water to move from the higher concentration on the outside, to the lower concentration on the inside by the process of osmosis.
Once inside the roots, the water then continues to move through the cells in the cortex by osmosis, until it reaches the impermeable cell wall of the endodermis. The fact that the water cannot travel between the cells, means that it has to travel symplasticly through the cell membrane. Once it passes through, it reaches the xylem.
The water travels up the xylem, which means it goes against gravity. Water is able to do…