What is the process called when a plant loses water through its leaves in the form of vapor?

Transpiration is the process whereby plants lose water primarily from their leaves in the form of vapor. It plays a crucial role in the overall water cycle and plant health. When water evaporates from the stomata (tiny openings on leaves), it creates a negative pressure within the plant that facilitates the uptake of water and nutrients from the roots through the xylem.

This process not only helps to regulate temperature within the plant but also contributes to the movement of water and nutrients necessary for growth and photosynthesis. As water vapor escapes, it creates a continuous flow of water from the roots to the leaves, thereby maintaining cellular turgor pressure and helping the plant remain upright and healthy.

The other options relate to different processes: evaporation refers to the transition of water from liquid to vapor, absorption is the uptake of water and nutrients by the roots, and photosynthesis is the process through which plants convert light energy into chemical energy, utilizing carbon dioxide and water to produce glucose and oxygen.