Transpiration Stream - GCSE Biology

🦊 In this GCSE Biology video, we explain transpiration as the process of water evaporation from the surface of plant leaves. When stomata on the leaves open to allow carbon dioxide in, water also evaporates from the cells and diffuses out through the stomata. This evaporation creates a water potential gradient that draws water up from the xylem, replacing the lost water. The video highlights the importance of understanding the relationship between open stomata, evaporation, and diffusion in the process of transpiration. It also discusses how water movement in the xylem, aided by cohesion among water molecules and the structural strength of lignin in xylem walls, forms a continuous stream from the roots to the leaves. The role of osmosis in replacing water lost through transpiration is also covered, emphasizing its significance in biology.

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