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A-Level Biology OCR A

Water Setting Explain Precautions Potometer Leafy Shoot Cut

Precautions when setting up a potometer include cutting the shoot under water to prevent xylem blockage, allowing plant acclimatization, and sealing all joints to ensure measured water loss is due to transpiration.

Las precauciones al configurar un potómetro incluyen cortar el tallo bajo el agua para evitar obstrucciones en el xilema, permitir la aclimatación de la planta y sellar todas las juntas para asegurar que la pérdida de agua medida sea por transpiración.

Front Explain precautions that must be taken when setting up potometer.
Back Setting up potometer:
  • Leafy shoot should be cut and inserted into potometer under water - only water is in xylem so it is not clogged
  • Once set up, leave apparatus for some time before taking measurements - acclimatise the plant for new conditions
  • All joints must be sealed with waterproof jelly to make sure that any water loss measured is a result of transpiration from stem and leaves

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