GCSE Biology (AQA)

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Investigating Transpiration Rate

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Organisation Plant Tissues, Organs and Systems

Investigating Transpiration Rate

1:51 Investigating Transpiration
Spec 4.2.3.2
Previous Factors Affecting Transpiration Next Pathogens
  • Transpiration rate in plants can be investigated using a barometer.
  • A barometer setup includes a plant chute inserted through a rubber bung into water, with water represented in blue in the diagram.
  • The apparatus features a reservoir, a scale (yellow section), and a tube with an air bubble.
  • The tube extends into a beaker of water.
  • As the plant transpires and takes up water, the air bubble in the tube moves along the scale.
  • Transpiration involves water evaporation from leaf surfaces, which pulls water up the glass tube, moving the bubble along the scale.
  • Transpiration rates can be determined by recording the movement of the bubble over a known period of time.
  • The position of the bubble is recorded at regular intervals under different conditions and with different plants.
  • Factors that can increase the rate of transpiration include light intensity, temperature, airflow, and humidity.
  • Investigations can also explore how Stata distribution affects transpiration rates.

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