Question

The most important function of transpiration in plants is to cause

• A. Loss of surplus water
• B. Cooling of the plant
• C. Rapid ascent of sap
• D. Rapid rise of minerals

Answer 1

Answer: (B)

Cooling of the plant

Transpiration helps in movement of xylem sap, which also increases the absorption of mineral nutrients by the roots from the soil.
Transpiration causes cooling of leaves. Some solar radiations cause heating of the leaves. However, transpiration reduces heating of leaves. The additional water is transpired to the atmosphere from the aerial parts of the plants.