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Water Potential & Transpiration AP Lab #9 Plant Structure – Ch 35 Transport in Plants – Ch 36 Water potential • Water potential = potential energy of water – Amount of water and its potential “pull” – ml of water/mass of plant • Recall water’s essential properties that lead to its universality in living organisms… – – – – – 1. 2. 3. 4. 5. Water loss from a plant – transpiration <object style="height: 390px; width: 640px"><param name="movie" value="http://www.youtube.com/v/At1BJJDcXhk?version=3"><param name="allowFullScreen" value="true"><param name="allowScriptAccess" value="always"><embed src="http://www.youtube.com/v/At1BJJDcXh Basic plant structure • Roots • Stems • leaves 3 main cell types make up tissue types – parenchyma – collenchyma – sclerenchyma 3 main tissue types • Dermal tissue • Ground tissue • Vascular tissue Transport through the plant - Vascular Tissue – Water & solute transport vs. sugar transport • Xylem • phloem Transpiration - from root to stem to leaf • 1. Water enters root – low water potential and hydrostatic pressure 2. Water enters stem – capillary action and adhesion; water potential 3. Water leaves leaf – evaporative pull and water potential A closer look at the root Water moves into root via apoplastic movement and symplastic movement Ions taken into root from the soil water create a low water potential in root hairs Water moves around and through Parenchyma cells that make up the ground tissue of the root, into the vascular cylinder • <object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/o32jqyIpoHg?fs=1&hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.you Movement through stem is via vascular bundles leaves • Water potential of outside environment is less than internal environment • Stomata regulate the flow • Water moves from high water potential to low • Flow of water? Your turn… • Hypothesize on how the environmental conditions of our lab will affect water movement • Trace a water molecule from root to leaf, using all appropriate vocabulary and plant structures. – Water vocab – Plant structure vocab Environmental challenges for plants • <object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/mc9gUm1mMzc?fs=1&hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.you