Question

write notes on Transpiration

Answer 1

There are stomata on the leaves of the plants. Through these opening the excess of water is thrown out in the form of water vapours. This process is called transpiration.

• There are two guard cells around the opening of stomata. They have an external membrane. They control the opening and closing of the stomata.
• Also some amount of water is lost due to evaporation from the leaves.
• As a result, water level in the epidermal layer of the leaf decreases.
• To compensate this loss, more water is brought to the leaves through the xylem.
• Transpiration thus helps in absorption of water and minerals and their distribution to all parts of the plant.
• Root pressure pushes the water up during the night time.
• Plants get rid of excess water by transpiration. It helps to keep the surface of the leaves cool.