Question

How does transpiration help in the uptake of water from the soil?

Answer 1

Transpiration is the loss of water in vapour form from the leaves into the air. As water is used up or lost from the leaves, more is sucked up from the xylem vessels. It’s like sucking water up a straw. So there is a continuous flow of water from the roots to the leaves. This movement of water up the xylem is called the transpiration stream.

Answer 2

As water evaporates, a suction force is created, which draws water up through the stem.