The process by which plants lose water vapor through pores is called transpiration. This vital biological process occurs primarily through small openings on the surface of leaves known as stomata. During transpiration, water absorbed by the roots moves up through the plant and evaporates into the atmosphere from the leaf surfaces. This process not only helps regulate the plant's temperature but also creates a negative pressure that assists in the uptake of nutrients and water from the soil. Transpiration is essential for maintaining the water cycle and promoting healthy plant growth and development.