CAIE IGCSE Biology 8.3.4 Leaf Features Affecting Water Vapour Loss
Practise linking internal leaf surface area and stomatal number or size to the quantity of water lost by transpiration.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- link interconnecting mesophyll air spaces to a large internal surface for evaporation
- explain that more or larger open stomata provide greater area for water vapour diffusion
- interpret carbon-dioxide and transpiration patterns as evidence of changes in stomatal opening
8.3.4—Water vapour loss is related question 1
Fig. 5.1 is a graph showing the effect of temperature on the rate of transpiration from the upper and lower surfaces of a leaf that is provided with a constant supply of water.
Fig. 5.1
Suggest how the structure of the lower surface differs from the upper surface of the leaf used in this investigation.
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