Transpiration in plants is

• A. The uptake of carbon dioxide.
• B. The loss of water vapor from leaves that helps pull water up through the plant.
• C. The production of glucose in photosynthesis.
• D. The release of oxygen from roots.

Answer: (B)

Transpiration is the loss of water vapor from the aerial parts of the plant, mainly leaves, through openings called stomata. As water evaporates from the leaf surface, it creates a pulling force that draws more water up from the roots through the xylem. This movement relies on cohesion between water molecules and adhesion to the xylem walls, helping transport water and minerals to all parts of the plant and also helping cool the leaf. It’s not about taking in carbon dioxide, producing glucose, or releasing oxygen from roots—the process specifically involves water loss and its role in pulling water upward.