Question

The loss of water from the leaves of the plant is transpiration. How will this process be advantageous for the plants?
(a) It helps in the downward movement of the water.
b) It helps the plant to maintain temperature in hot sunny days.
(c) It acts as a driving force for distribution of food in plant's body.
(d) Helps maintain a constant level of water in the soil around the plant.​

Answer 1

The transpiration process is advantageous for the plants as- b) It helps the plant to maintain temperature in hot sunny days.

Transpiration process is advantageous to the plant in several ways.

• The loss of water through transpiration creates a pull that helps the plant to absorb water and minerals from the soil. It also helps in the transport of water from roots to different plant parts (upward movement).
• Most of the water absorbed by the roots from the soil is lost by the transpiration process. Thus, transpiration helps in the elimination of excess water present in the plant.
• In hot and dry conditions, the rate of transpiration increases. This increases the loss of water by evaporation and cools the surface of plants. Thus, transpiration helps in maintaining the temperature of plants.

Answer 2

The loss of water from the leaves of the plant is transpiration. The process is advantageous for the plants as it helps the plant to maintain the temperature on hot sunny days. (OPTION B)

TRANSPIRATION -

• The process of movement of water across the plant and the evaporation from the aerial parts of the plant.
• The process plays an important role and exerts a transpirational pull for the ascent of sap.
• The excessive water is removed causing a cooling effect that helps in lowering the temperature of the plant by 10 - 15 degrees celsius.
• Transpiration provides mechanical rigidity and strength to the plant.
• The process helps in hardening and turgidity to maintain the shape of the plant parts.
• The concentration of salt is increased by the increase in the transpiration process.