What process describes the movement of water through a plant and its evaporation from aerial parts such as leaves, stems, and flowers?

What process describes the movement of water through a plant and its evaporation from aerial parts such as leaves, stems, and flowers?

• A. Osmosis
• B. Translocation
• C. Absorption
• D. Transpiration

Answer: (D)

Transpiration is the movement of water through a plant and its evaporation from aerial parts such as leaves, stems, and flowers. Water enters the plant through the roots and travels upward via the xylem, driven by cohesion and adhesion as a continuous column. When water reaches the leaves, it evaporates into the air through openings called stomata (and to a lesser extent through the cuticle). This evaporation creates a negative pressure that pulls more water up from the roots, enabling nutrient transport and helping to cool the plant. The rate of transpiration is influenced by environmental factors like light, temperature, humidity, and wind, as well as how open the stomata are. In contrast, osmosis refers to water movement across membranes due to concentration differences, absorption is the initial uptake of water by roots, and translocation is the movement of sugars in the phloem.

Transpiration is the movement of water through a plant and its evaporation from aerial parts such as leaves, stems, and flowers. Water enters the plant through the roots and travels upward via the xylem, driven by cohesion and adhesion as a continuous column. When water reaches the leaves, it evaporates into the air through openings called stomata (and to a lesser extent through the cuticle). This evaporation creates a negative pressure that pulls more water up from the roots, enabling nutrient transport and helping to cool the plant. The rate of transpiration is influenced by environmental factors like light, temperature, humidity, and wind, as well as how open the stomata are. In contrast, osmosis refers to water movement across membranes due to concentration differences, absorption is the initial uptake of water by roots, and translocation is the movement of sugars in the phloem.