Transpiration is the evaporation of water from the leaves through the stomata.

Transpiration is the evaporation of water from the leaves through the stomata.

• A. Absorption of minerals by roots
• B. Gas exchange in the stomata
• C. Evaporation of water from leaves through the stomata
• D. Water movement through xylem from roots to leaves

Answer: (C)

Transpiration is the evaporation of water from the leaves through the stomata. Stomata are tiny openings on the leaf surface that open and close to regulate gas exchange and water loss, controlled by guard cells. Water inside the leaf moves to these surfaces, evaporates into the air spaces, and exits as water vapor through the stomata. This water loss creates a negative pressure that helps pull water up from the roots through the xylem, supporting the plant’s water transport and cooling leaves. Absorption of minerals by roots is about nutrient uptake, not water loss. Gas exchange in the stomata refers to CO2 entering and O2 leaving for photosynthesis and respiration, which is related to stomatal function but not the evaporation of water itself. Water movement through the xylem from roots to leaves describes the transport system that carries water upward, which transpiration drives, but it’s not the act of water evaporating from the leaves.

Transpiration is the evaporation of water from the leaves through the stomata. Stomata are tiny openings on the leaf surface that open and close to regulate gas exchange and water loss, controlled by guard cells. Water inside the leaf moves to these surfaces, evaporates into the air spaces, and exits as water vapor through the stomata. This water loss creates a negative pressure that helps pull water up from the roots through the xylem, supporting the plant’s water transport and cooling leaves.

Absorption of minerals by roots is about nutrient uptake, not water loss. Gas exchange in the stomata refers to CO2 entering and O2 leaving for photosynthesis and respiration, which is related to stomatal function but not the evaporation of water itself. Water movement through the xylem from roots to leaves describes the transport system that carries water upward, which transpiration drives, but it’s not the act of water evaporating from the leaves.