The evaporation of water from the mesophyll cells followed by loss of water through the stomata. This lowers the water potentional in the tissues of the leaf.
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How can the structure of a leaf affect transpiration?
The thick, waxy cuticle reduces evaporation. Stomata may sink into pits and trap humid air. Surface area may be reduced due to the shape of the leaf.
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What atmospheric conditions affect transpiration?
Humidity, temperature, light intensity, and wind.
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How does humidity affect transpiration?
If there is low humidity, transpiration is increased as the water potentional gradient between the leaf and the atmosphere is higher.
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How does wind affect transpiration?
If there is a lot of fast wind, transpiration is increased as humid air is removed from the surface of the leaf.
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How does temperature affect transpiration?
If there is a high temperature, the water holding capacity of the air is increased, therefore increasing transpiration.
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How does light intensity affect transpiration?
If there is a high light intensity, transpiration increases, this is because stomatal pores are open wider, which allows photosynthesis.
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How do guard cells aid transpiration?
When guard cells are full of water, they swell and open the stoma. Guard cells then limp with lack of water, closing the stoma.
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Other cards in this set
Card 2
Front
How can the structure of a leaf affect transpiration?
Back
The thick, waxy cuticle reduces evaporation. Stomata may sink into pits and trap humid air. Surface area may be reduced due to the shape of the leaf.
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