IGCSE Biology - Transpiration (8.3)

Cambridge IGCSE Biology (0610/0970)
Chapter 8 - Transport in plants
Topic 8.3 - Transpiration
For exams in 2023, 2024 & 2025 (core and extended)

As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam!

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Timestamps:
0:00 Contents
0:33 Transpiration
1:03 Rate of transpiration
2:17 Air spaces and stomata (extended)
3:17 Transpiration pull (extended)
3:44 Temperature, wind speed and humidity (extended)
4:50 Wilting (extended)

Core content:
- Describe transpiration as the loss of water vapour from leaves.
- 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.
- Investigate and describe the effects of variation of temperature and wind speed on transpiration rate.

Extended content:
- 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.
- 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 (cohesion) between water molecules.

- Explain the effects on the rate of transpiration of varying the following factors: temperature, wind speed and humidity.
- Explain how and why wilting occurs.

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Is wilting and plasmolysis the same thing?