Water reaches the top of a plant due to

Root pressure is $................$.

Who proposed the "Relay pump theory" of ascent of sap?

Which two statements are wrong for transpiration pull theory?
$(i)$ There is a continuous network of water channels from the root hairs to the tips of the leaves.
$(ii)$ Due to adhesive force between molecules of water,the water column has a great tensile strength.
$(iii)$ There is a cohesive force between the wall of the xylem vessels and water.
$(iv)$ Transpiration pull is strong enough to pull up the column of water to a great height.

$A$ column of water within xylem vessels of tall trees does not break under its weight because of

The best vital force theory was proposed by