The loss of water in the form of vapour from the aerial parts of the plant is known as _____________________.

The loss of water in the form of vapor from the aerial parts of the plant is known as transpiration.

Transpiration is a vital process for plants, as it plays a crucial role in water regulation and nutrient uptake. During transpiration, water evaporates from plant surfaces, particularly from tiny openings called stomata, which are found mainly on the undersides of leaves. This loss of water creates a negative pressure that helps in the upward movement of water and dissolved minerals from the roots through the xylem to other parts of the plant. Transpiration also helps in cooling the plant and maintaining its cell turgidity, thus supporting overall plant health and growth. Beyond physiological importance, transpiration is a key component of the water cycle, contributing to humidity and precipitation in the environment.