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Transpiration Lab Bio 20(1) (1).docx - Transpiration Lab...

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Plants play an important role in the biogeochemical cycling of water through the biosphere.Plants take up water through their roots either from the lithosphere or the hydrosphere.Plants also lose water to the atmosphere by the process of transpiration (evaporation fromplants). In this lab you will measure the rate at which transpiration occurs, and what factorseffect the rate of transpiration.Transpiration LabBiology 20: HydrologicCycle/Transpiration LabBy: Siddhartha Paudel
Transpiration LabPROBLEM:How do different factors (wind, light, and heat) effect the rate at which transpiration within a plantleaf occurs?VARIABLES(for all manipulations):Manipulated Variable: Factors affecting the rate of transpiration (wind, light, heat)Responding Variable: The rate of transpiration (measured by change in mass (g))Controlled Variable: Time period tested for (21 hours), type of plant leaf used, and the amount ofwater in each beaker(10mL Cylinder)Control Group: No manipulation group of plants (Not being affected by the different factors [wind,light, heat])HYPOTHESIS: (If… then… because…) (Light)If we calculate the mass of the leaf before and after leaving it out for 24 hours with 10 milliliters ofwater, then the leaf that is exposed to the light will have the highest rate of transpiration becausethe stomata of the plant will be opened when it is subjected to a source of light. The stomata is apore found in the epidermis of a leaf, and it is responsible for regulating water movement throughtranspiration. If the stomata is exposed to light, it will open, and will shift large amounts of waterout of the leaf through transpiration, which leads me to believe that the plant leaf exposed to thesource of light will have the most loss in water.

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Term
Winter
Professor
NoProfessor
Tags
Photosynthesis, Fern, Transpiration Lab

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