transpiration

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6 Terms

1
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transpiration

evaporation of water from the walls of mesophyll cells followed by diffusion of water vapour through the stomata to the atmosphere

2
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high temperatures

increases transpiration…water molecules have more kinetic energy so evaporation and diffusion occur faster

3
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high humidity

decreases transpiration…water potential is less steep so water diffuses slowly

4
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high wind speed

increases transpiration…moving air carries water vapour maintaining water potential

5
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high light intensity

may increase transpiration…plant will photosynthesis rapidly needing more CO2 so stomata open and water vapour diffuses more rapidly

6
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potometer

measures the rate of water uptake