IGCSE Biology / Transport in plants
Practical: what changes the rate
Edexcel International GCSE Biology (4BI1), chapter 11: Transport in plants, specification point 2.57B, 2.58B. Part of the full course.
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A potometer investigates how conditions affect the rate of transpiration by measuring water uptake by a shoot. Temperature, humidity, wind speed and light intensity change transpiration by changing evaporation, stomatal opening or the water vapour concentration gradient.