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IB Biology Plant Science 9.2.9

Explain how abiotic factors affect transpiration rate in a terrestrial plant

Maria Huynh

on 11 November 2012

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Transcript of IB Biology Plant Science 9.2.9

Explain how abiotic factors affect transpiration rate in a terrestrial plant Maria Huynh
Plant Science 9.2.9 Quick Facts Transpiration? Basically, plants have roots that takes water and nutrients into the stems and leaves. Some of that water is released into the air by evaporation. Terrestrial plants are plants that grow on land. Abiotic components are the nonliving components
of the biosphere. Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. So Basically, Transpiration is the loss of water by evaporation from the leaves and stems of plants. The rate of transpiration varies due to various reasons, such as temperature, humidity, sunlight availability and intensity, precipitation, soil type and saturation, wind, land slope, and water use and diversion by people. Is invisible, we’re not seeing sweating plants anytime soon! a large oak tree can transpire 40,000 gal/yr! "Transpiration - Water Movement through Plants." Plant and Soil Sciences ELibrary. N.p., n.d. Web. 10 Nov. 2012. <http://passel.unl.edu/pages/informationmodule.php?idinformationmodule=109285384>. "The Water Cycle: Transpiration." , from USGS Water-Science School. N.p., n.d. Web. 10 Nov. 2012. <http://ga.water.usgs.gov/edu/watercycletranspiration.html>. Citations Damon, Alan. "Chapter 9.2.9." Biology: Higher Level (plus Standard Level Options) : Developed Specifically for the IB Diploma. Harlow: Pearson, 2010. 246-52. Print. Decreases when humidity increases because at high humidity, the air is saturated with water so evaporation stops. Increases when light intensity increases because more stomata open in strong light to maximize the rate of photosynthesis. Increases when temperature increases because water molecules evaporate faster creating negative pressure at the stomata. Affects with abiotic factors Increases as wind speed increases because air movement carries water vapor away from stomata creating negative pressure at the stomata.
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