Why and how does water enter continuously into the root xylem ?

Explanation

Cells of root are in close contact with soil and so actively take up ions. The ion-concentration, increases inside the root and therefore osmotic pressure increases the movement of water from the soil into the root which occurs constantly. In xylem tissue, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water-conducting channels reaching all parts of the plant. At the roots, cells in contact with the soil actively take up ions. This creates a difference in the concentration of these ions between the root and the soil. Water, therefore moves into the root from the soil to eliminate this difference. This means that there is steady movement of water into root xylem, creating a column of ater thet is steadily pushed upwards.