What does the term "transpiration" primarily refer to in plants?

Transpiration primarily refers to the process of water loss from a plant's leaves. During transpiration, water evaporates from the stomata (tiny openings) on the surface of leaves, which plays a critical role in the plant's ability to absorb nutrients from the soil and maintain temperature. This process helps create a negative pressure within the plant, facilitating the upward movement of water and nutrients from the roots through the xylem.

Understanding transpiration is essential because it is not just about water loss; it is also a vital part of the overall water cycle and contributes to a plant's health and growth. By regulating water content, transpiration aids in photosynthesis and affects how plants respond to their environment.