Edexcel IGCSE Biology · Spec 2.55B-2.58B
Transpiration
What transpiration is, the four factors that affect its rate, and how a potometer measures water uptake.
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Transpiration
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Spec 2.55B-2.58B
What you need to know
- Explain what transpiration is
- Describe four factors that affect its rate
- Describe how a potometer measures it
Active recall
Quick check
Answer each question before opening the answer.
Define transpiration.
The loss of water vapour from the leaves by evaporation followed by diffusion through the stomata.
Name three factors that increase the rate of transpiration.
Higher temperature, higher light intensity, more air movement (wind), and lower humidity.
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