CAIE IGCSE Biology 8.3.2 How Transpiration Occurs
Practise tracing water from evaporation at mesophyll surfaces to diffusion through leaf air spaces and stomata.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that liquid water evaporates from the moist surfaces of mesophyll cells
- trace water vapour into interconnecting leaf air spaces
- explain diffusion of water vapour down its gradient through open stomata to the atmosphere
8.3.2—Water evaporates from the surfaces question 1
Some students set up the apparatus shown in Fig. 6.1 to compare transpiration in two sets of leaves.
Set A was kept in a transparent bag and set B was left in the open air.
All other conditions were kept constant.
The mass of the leaves in each set was measured at the start of the investigation and after five hours.
Fig. 6.1
Explain how transpiration occurred in the leaves shown in Fig. 6.1.
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