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Turgor Pressure Plants without water…what happens? What is it? Turgor Pressure • Water-filled vacuoles push against cell walls of a plant. This creates a pushing force called turgor pressure. • Why it’s important: Together, the cell wall and the water-filled vacuole provide structural support for plants. Plants stand upright because of turgor pressure, the force of water pressing against their cell walls. Turgor Pressure On the left: lots of water On the right: not enough water (Notice the change in the vacuole) http://www.youtube.com/watch?v=fhsurzE_-J0 Balloons…. Draw this: Carries water and minerals from the roots through the stem and leaves The Xylem themselves are a STRUCTURAL adaptation The carrying of water is a PHYSIOLOGICAL adaptation: some plants carry the water faster than others…. Let’s explore how the Xylem works in celery and carnations Dehydration • Salt and sugar can act as dehydrators: taking water out of the cell • If they are added to a plant cell, what do you think will happen? • Let’s see. Cucumbers……. Now let’s explore using a slice of potato Write the lab in your ISN…. • Question: How will a salt solution affect a potato? Hypothesis: Choose a hypothesis below and write it in your journal. • If a potato slice is placed in salt water then it will become flexible because the vacuoles in the cells have dehydrated. OR • If a potato slice is placed in salt water then it will become smaller because the vacuoles in the cells have dried out. Copy the chart into your journal Experiment: Water Type Salt Water Distilled Water Mass before Mass After Observations Hypothesis: • If we put the potato slice in salt water then ________ will happen because __________. Experiment: Water Type Salt Water Distilled Water Mass before Mass After Observations While we wait… https://www.youtube.com/watch?v=fhsurzE_-J0 • http://www.youtube.com/watch?v=fNyYuVarTIQ • http://www.youtube.com/watch?v=qrp7V0Q5qY Q • https://www.youtube.com/watch?v=d26AhcKeEb E&list=PLE720771409B9EF4A&index=3 While we wait… Forces in Living Systems • The teeth apply force in breaking food into smaller pieces • Muscles in the esophagus exert a force in pushing food down the digestive tract through peristalsis • Muscles contract and relax, creating a enough force to move bones to walk, run, jump or engage in other life processes • The heart supplies the force that causes blood to flow through blood vessels. Analysis: 1. What did you notice about the potato in the salt water? 2. How did this happen? 3. What happens when a plant wilts? Conclusion: summary Tell me if your hypothesis was valid or invalid. Explain why! Show your teacher your journal when you are done to receive your stamp