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Transpiration
Explain transpiration as the process where water vapor is lost from leaves.
7
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70
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49
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90 min
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CambridgeIGCSEBiologyTransport in plants
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Transpiration outcomes7 objectives
- Explain transpiration as the process where water vapor is lost from leaves.
- Indicate that water evaporates from mesophyll cell surfaces into air spaces and then diffuses out of leaves through stomata as vapor.
- Examine and explain how changes in temperature and wind speed affect the rate of transpiration.
- Clarify how the loss of water vapor is connected to the large internal surface area from the air spaces between mesophyll cells and the size and number of stomata.
- Describe the process by which water ascends in the xylem due to a transpiration pull that draws a column of water molecules, which are held together by attractive forces.
- Discuss how varying factors such as temperature, wind speed, and humidity influence the rate of transpiration.
- Explain the process and reasons behind wilting in plants.
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