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Transpiration is the loss of water vapour from the aerial parts of a plant, predominantly through the stomata of the leaves. While transpiration is an inevitable consequence of gas exchange, it plays a vital role in driving the movement of water through the plant. This lesson covers the factors that affect transpiration rate, the potometer practical, guard cell function and xerophyte adaptations, as required by Edexcel GCSE Biology (1BI0) Topic 6.
Transpiration is defined as the loss of water vapour from the surfaces of a plant, mainly through the stomata in the leaves.
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