Which process in plants involves the loss of water through stomata, contributing to water transport from roots to leaves?

Which process in plants involves the loss of water through stomata, contributing to water transport from roots to leaves?

• A. Transpiration
• B. Photosynthesis
• C. Guttation
• D. Respiration

Answer: (A)

Transpiration is the loss of water vapor from a plant, mainly through the stomata. When water evaporates from the leaf surfaces, it creates a suction that pulls more water up from the roots through the xylem. This continuous water column is held together by cohesion between water molecules and adhesion to the xylem walls, enabling the upward transport of water and minerals. Transpiration also helps cool the leaves. Stomata open to allow gas exchange for photosynthesis, but that opening causes water loss as a side effect. Guttation happens when root pressure forces water out at leaf edges, usually at night and not as the main mechanism of water transport upward. Respiration uses oxygen and releases energy, producing water as a byproduct, but it does not drive the upward movement of water through the plant.

Transpiration is the loss of water vapor from a plant, mainly through the stomata. When water evaporates from the leaf surfaces, it creates a suction that pulls more water up from the roots through the xylem. This continuous water column is held together by cohesion between water molecules and adhesion to the xylem walls, enabling the upward transport of water and minerals. Transpiration also helps cool the leaves.

Stomata open to allow gas exchange for photosynthesis, but that opening causes water loss as a side effect. Guttation happens when root pressure forces water out at leaf edges, usually at night and not as the main mechanism of water transport upward. Respiration uses oxygen and releases energy, producing water as a byproduct, but it does not drive the upward movement of water through the plant.