Question

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

Answer 1

Cells of root are in close contact with soil and so actively take up ions. The ion-concentration, increases inside the root and hence osmotic pressure increases the movement of water from the soil into the root which occurs continuously.

Answer 2

Cells of roots are in close contact with soil and so actively take up ions.The ion concentration increases inside the roots and hence the osmotic pressure increases the movement of water from the soil into the root which occurs continuously.Transpiration also plays a major role in causing osmotic pressure..