Contents
Key Stage 4
Meaning
Transpiration is the process by which water is transported from the roots of a plant to the leaves.
About Transpiration
- In transpiration water evaporates from the leaves and is then replaced by water that is drawn up through the stem from the roots.
- Transpiration is needed to bring a constant supply of water and minerals to the leaf for photosynthesis.
- Water is lost from the plant through the stomata, so it is important for the plant to be able to close the stomata to control water loss.
- If too much water is lost through transpiration the plant may begin to wilt.
- The rate of transpiration can be measured using a potometer.
Factors Affecting Transpiration
The rate of transpiration is affected by:
- Temperature - High temperatures lead to quicker evaporation of water increasing the rate of transpiration.
- Humidity - High humidity makes it harder for water to evaporate slowing the rate of transpiration.
- Wind - The constant flow of air causes evaporation to happen more quickly increasing the rate of transpiration.
References
AQA
- Transpiration, page 70-5, GCSE Biology; Student Book, Collins, AQA
- Transpiration, page 72, GCSE Combined Science Trilogy 1, Hodder, AQA
- Transpiration, pages 39, 89, GCSE Combined Science; The Revision Guide, CGP, AQA
- Transpiration, pages 43, 44, 112, GCSE Biology; The Revision Guide, CGP, AQA
- Transpiration, pages 66-69, 272-273, 279, GCSE Biology; Third Edition, Oxford University Press, AQA
- Transpiration, pages 86-88, 269, GCSE Combined Science Trilogy; Biology, CGP, AQA
- Transpiration, pages 9, 71-2, 73, GCSE Biology, Hodder, AQA
- Transpiration, pages 92-94, 330, GCSE Biology, CGP, AQA
- Transpiration, pages 97, GCSE Combined Science Trilogy 2, Hodder, AQA
- Transpiration; investigation of, page 73, GCSE Combined Science Trilogy 1, Hodder, AQA
- Transpiration; rate 40, GCSE Combined Science; The Revision Guide, CGP, AQA
- Transpiration; rate, page 44, GCSE Biology; The Revision Guide, CGP, AQA
Edexcel
- Transpiration, pages 132-133, GCSE Biology, Pearson, Edexcel
- Transpiration, pages 207, 208, 210, 211, GCSE Biology, CGP, Edexcel
- Transpiration, pages 49, 50, GCSE Combined Science; The Revision Guide, CGP, Edexcel
- Transpiration, pages 71, 72, GCSE Biology; The Revision Guide, CGP, Edexcel
OCR
- Transpiration, pages 32-34, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
- Transpiration, pages 39-41, Gateway GCSE Biology; The Revision Guide, CGP, OCR
- Transpiration, pages 80-83, Gateway GCSE Biology, Oxford, OCR
- Transpiration; factors affecting rate, page 34, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
- Transpiration; factors affecting rate, page 40, Gateway GCSE Biology; The Revision Guide, CGP, OCR
- Transpiration; investigating rate, page 34, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
- Transpiration; investigating rate, page 41, Gateway GCSE Biology; The Revision Guide, CGP, OCR