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Learn: Diffusion and Osmosis
WJEC GCSE in BIOLOGY specification
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Welcome!Today we'll learn about diffusion and osmosis. These processes are essential for how substances move in and out of cells. Let's explore this step by step!
What is Diffusion?Diffusion is the movement of particles from an area of high concentration to an area of low concentration. It happens until the particles are evenly spread out. For example, oxygen moves into cells through diffusion.
Quick check: Diffusion moves particles from?
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What is Osmosis?Osmosis is the movement of water molecules across a selectively permeable membrane, from an area of high water concentration to an area of low water concentration. This process is vital for cells to maintain balance.
Key Difference Between Diffusion and OsmosisDiffusion can involve any particles, like gases or solutes, while osmosis is specifically the movement of water. Both rely on concentration gradients.
Osmosis moves water molecules from a region of {{blank0}} water concentration to {{blank1}} water concentration.
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Why Are These Processes Important?Diffusion and osmosis are crucial for cells to take in nutrients, remove waste, and maintain water balance. Without these processes, cells wouldn't function properly.
Which of the following are examples of diffusion or osmosis? (Select all that apply)
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Real-World Example: Visking TubingVisking tubing acts as a model for a selectively permeable membrane. It allows small molecules like water to pass through, but blocks larger molecules like starch. This demonstrates the process of diffusion and osmosis effectively.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You've learned about diffusion and osmosis. Now let's test your understanding with a few review questions.
Which process involves water moving across a membrane?
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Which of the following are true about diffusion? (Select all that apply)
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Diffusion is the movement of substances from a {{blank0}} concentration to a {{blank1}} concentration.
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Well Done!You've completed the lesson on diffusion and osmosis. Keep practicing to strengthen your understanding, and let me know if you have any questions!
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