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CAIE A-Level Biology 7.2.3 Transpiration from Leaves

Practise explaining mesophyll-wall evaporation and stomatal diffusion down a water-potential gradient, then interpret temperature, humidity, wind and aperture effects on rate.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • describe evaporation from moist mesophyll walls into internal leaf air spaces
  • explain diffusion of water vapour through stomata down a water-potential gradient
  • interpret temperature, humidity, wind and stomatal effects using the supplied evidence

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