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Understanding Diffusion: Examples in Plants and Animals

Learn about diffusion and its phenomenon, with examples of diffusion in plants and animals. Explore how particles move down a concentration gradient and how diffusion can be observed in various scenarios.

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Understanding Diffusion: Examples in Plants and Animals

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  1. Activity #1 • Spray perfume at the back of the room and then move to the front of the room. • Observe for 2-3 minutes. • Activity #2 • Fill a cup with water. Gently touch the surface of the water and taste the water. • Drop a sugar cube into the cup of water. • Taste the water after 10 minutes.

  2. DIFFUSION

  3. Learning Objectives • At the end of the lesson, you will be able to • Define diffusion and explain its phenomenon • Describe an example of diffusion in plants • Describe an example of diffusion in animals

  4. What happens during diffusion? http://www.youtube.com/watch?v=WxfIDpset2I

  5. Point A Point B

  6. NET

  7. Direction of particle movement (net) Particles diffuse down a concentration gradient Concentration of particles Distance B A Concentration gradient: The difference in concentration between two regions

  8. After some time… what will the concentration of particles at A and B look like? The concentration of particles at point A and B have become the same. There is no net movement of particles. Point A Point B

  9. A small beaker of distilled water was placed on a bench. Using a pipette, a drop of iodine was placed at the bottom of the beaker. Explain why the water in the beaker was uniformly yellow after two hours. After 2 hours There is a net movement of iodine molecules from where they are in a higher concentration which is at the bottom of the beaker to where they are in lower concentration which is the rest of the liquid in the beaker. Therefore, the iodine molecules spread out evenly after two hours.

  10. A small beaker of distilled water was placed on a bench. Using a pipette, a drop of iodine was placed at the bottom of the beaker. The beaker was uniformly yellow after two hours. • How can we increase the rate of diffusion in this case? • By heating the beaker of water

  11. Example of diffusion in animals: Diffusion of oxygen from lungs to red blood cells. Diffusion of carbon dioxide from blood to lungs. Example of diffusion in plants: Diffusion of carbon dioxide into the leaves of plants.

  12. Diffusion of oxygen from lungs to red blood cells

  13. Diffusion of carbon dioxide into the leaves of plants

  14. What have we learnt in today’s lesson? DIFFUSION Definition: The net movement of particles down a concentration gradient Atoms, ions or molecules The difference in concentration between two regions

  15. Explain what happened in… • Activity #1 • Spray perfume at the back of the room and then move to the front of the room. • Observe for 2-3 minutes. • Activity #2 • Fill a cup with water. Gently touch the surface of the water and taste the water. • Drop a sugar cube into the cup of water. • Taste the water after 10 minutes.

  16. Preparation for next lesson Potato experiment! Cut out a strip of potato Measure its length and breadth Soak it in tap water for 5 mins Measure its length and breadth again Soak it in saltish water for 5 mins Measure its length and breadth again Share findings with class! Don’t be a !!!!

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