Biology · IGCSE · Cambridge · Cambridge IGCSE (9–1) Biology 0970 (Extended) (2026–2028) · Specification point · 8.3 · Transport in plants
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8.3 Transpiration
| Core | Supplement |
|---|---|
1 Describe transpiration as the loss of water vapour from leaves | |
2 State that water evaporates from the surfaces of the mesophyll cells into the air spaces and then diffuses out of the leaves through the stomata as water vapour | |
3 Investigate and describe the effects of variation of temperature and wind speed on transpiration rate | |
4 Explain how water vapour loss is related to: the large internal surface area provided by the interconnecting air spaces between mesophyll cells and the size and number of stomata | |
5 Explain the mechanism by which water moves upwards in the xylem in terms of a transpiration pull that draws up a column of water molecules, held together by forces of attraction between water molecules
6 Explain the effects on the rate of transpiration of varying the following factors: temperature, wind speed and humidity |
7 Explain how and why wilting occurs |