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Warm-up: Jan 27th Open Moodle Write entire slide. Fill in blanks and define underlined prefixes growth Tropism is a plant’s _______________ response in _____________to an external ____________stimulus. Light •Phototropism•Geotropism (Gravitropism)•Hydrotropism Water •ThigmotropismTouch Earth/Gravity Title your page: Turgor Pressure Mini-Lab There are a few video links in this PPT. For you to access the videos, you need to… – Click on the Slide Show tab – Select “From Current Slide” Introduction Read Only Plants have water in their cell vacuoles. The water pushes (like a force) on the cell membrane and cell wall creating a type of pressure which makes the cell kind of stiff or rigid. This type of pressure is called turgor pressure, enabling the plant (or stem) to stand upright. Lack of water will cause a drop in turgor pressure, causing the plant to wilt and die if water is not replaced. Vacuole Pre-Lab Analysis Questions: Restate the question in your answer for each pre-lab question. 1. Watch video then write the definition of turgor pressure in your own words. Click HERE for video to play 5. How do you think a piece of wilted celery will change when it is soaked in water? Write a hypothesis using the If-Then format. a wilted celery stalk is soaked in water If___________________________________, the celery stalk would become rigid/stiff. then __________________________________ Example Your answer does not have to match this one. Before After Click HERE to play video Observations • Go to the lab station to feel the celery in the two beakers. – Make observations for about 10-20 seconds. • Do not take your notebook or pencil to the lab station. • When you finish observing, return to your desk. • Draw the T-Chart on the next slide. Leave room to sketch the two examples of celery in the correct column UNDER your word choices. Observations: Sketch this T-chart in your journal. Celery with low turgor pressure Celery with high turgor pressure Put ALL of the following words on the correct side of the T-Chart: highly bendable, rigid, stiff, flaccid, flexible, poorly bendable Conclusion: Write your conclusion in paragraph form (4-5 sentences.) Include the following in your conclusion: – State the purpose or objective of the lab In the turgor pressure lab, a celery stalk was used to demonstrate how… – Rephrase your hypothesis – Briefly summarize your T-Chart observations. What differences did you observe? – In the before and after pictures on Slide 10, did the water move into or out of the celery’s cells? (Hint: internal adaptation- X _ _ _ _ )