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A-Level Biology OCR A

Water Moves Stomata Transpiration Diffusion Open Explain Loss

Water loss is inevitable as stomata must open for gas exchange (CO2 and O2), which also allows water vapor to exit via diffusion when open.

La pérdida de agua es inevitable ya que los estomas deben abrirse para el intercambio de gases (CO2 y O2), permitiendo también la salida de vapor de agua por difusión cuando están abiertos.

Front Explain why water loss is inevitable for plants.
Back Why transpiration is inevitable:
  • CO2 moves in and O2 moves out of leaf by diffusion thru stomata
  • When stomata are open to allow gas exhange, water vapour also moves out by diffusion and is lost - transpiration
  • Stomata open/close to control amount of water lost, during the day must be open for photosynthesis but during night closed

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