Difference between revisions of "Transpiration"

Revision as of 15:50, 29 November 2019

Key Stage 4

Meaning

This diagram shows water being transported from the roots to the leaves of a plant.

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

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