Transpiration

The loss of water in the form of vapors from the aerial parts of the plant is called Transpiration.

It takes place mainly through Stomata.
The water which is lost through the stomata is replaced by water from the xylem vessels in the leaf.
Evaporation of water molecules from leaf ‘s cells creates a suction (transpiration pull) which pulls water from the xylem cells of the root.

3 Important Reasons for “Why is Transpiration Important for Plants?”

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It helps in the regulation of temperature.
Evaporation reduces the temperature of leaf surface.
Therefore, transpiration is useful to plants on hot sunny days. (At intense heat, the enzymes are destroyed).

Transpiration helps in the ascent of sap by producing a suction force acting from the top of a plant.
Evaporation from the leaves concentrates cell sap and increases their osmotic pressure.
This draws water from the cells at the lower levels in a sequential manner (ascent of sap) and finally favors absorption of water from the soil by the roots.
As the water evaporates from the leaves, a suction force is produced at the top of the plant drawing more water up through the stem and making the roots absorb more of it from the soil.
Transpiration helps in the absorption and upward movement of water and minerals dissolved in it from roots to the leaves.

Since leaves are present at the tips of all branches and twigs, transpiration from their surfaces
tends to draw water towards them and thus helps in the distribution of water throughout the plant body.
Transpiration maintains a constant supply of ions to the leaves.
Higher the rate of transpiration, greater the rate of absorption of water and solutes from the soil.
Transpiration also removes excess water from the plant