The movement of water and solutes in plants - envvironmental factors or signals also affect stomatal movement
6 important questions on The movement of water and solutes in plants - envvironmental factors or signals also affect stomatal movement
Which environmental factors affect stomatal movement?
Carbon dioxide concentration, light and temperature.
What does an increase in CO2 concentration cause in most species?
Clossure of stomata
Why are stomata's in general open during the day
Due to Photosynthetic ustilization of CO2, which reduces CO2 levels in the leaf.
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Why do plants close their stomata at high temperatures?
Due to the high temperatures the respiration levels rise which causes the internal leaf CO2 concentraion to rise. Therefore no longer requiering CO2 from the enviroment thuse closing the stomata will stop dehydration
How do CAM plants aquire CO2 since their stomata are closed during the day?
CO2 is taken up during the night and converted into organic acids, during the day CO2 is released again.
Name at least three factors which influence transpiration and how
1 Temperature: The rate of water evaportion doubles for every rise of 10degreesC, however evaporation also cools the leaf.
2 Humidity: The rate of transpiration is proportional to the vapor pressure difference( difference in water vapor pressure betweern intercellular spaces and surface of the leaf)
3 Air currents: A breeze blows away water vapor accumulated near the leaf surface.
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