Which process is the evaporation of water from the leaves of a plant?

• A. Respiration
• B. Condensation
• C. Precipitation
• D. Transpiration

Answer: (D)

Transpiration is the process of water evaporating from plant surfaces, especially the leaves, through the stomata. As water travels from the roots up the plant, it reaches the leaves and evaporates from cell surfaces, exiting as water vapor. This not only cools the leaf but also helps pull more water up the plant due to cohesion and tension in the water column. In contrast, respiration is the energy-releasing process inside cells, condensation is water vapor turning into liquid, and precipitation is rain forming in the atmosphere. So the evaporation from leaves is transpiration.