Diffusion Vs Osmosis
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Diffusion Vs Osmosis

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MISCONCEPTION IN BIOLOGY...

MISCONCEPTION IN BIOLOGY
DIFFUSION VS OSMOSIS

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  • 1. ICT IN BIOLOGY
    DIFFUSION VSOSMOSIS
  • 2. YAASHINI A/P SELVARAJAH D20091034837
    NATASHA KAUR A/P MINDAR SINGH D20091034839
    AMARPREET KAUR A/ GURNAM SINGH D20091034873
    KRISNAVIMALA A/P KRISHUAN D20091034821
    Group members
  • 3. What???How???Differences???Similarities????HOW?WHATZ TAT???DIFFERENCES?
    Any ideas??
  • 4.
  • 5. EXAMPLES
  • 6.
  • 7. EXAMPLES
  • 8. comparison
  • 9. DIFFERENCES
    DIFFUSION
    OSMOSIS
    • Nature of transport (presence of a semi-permeable membrane)
    • 10. Flow from [higher] to [lower] of solute
    • 11. Flow from [lower] to [higher] of solvent
    • 12. Between gas molecules, solid-liquid or liquid-gas
    • 13. Relatively faster
    • 14. Can spread over long distance
    • 15. Nature of transport ( no such membrane required )
    • 16. Flow from [lower] to [higher] of solute
    • 17. Flow from [higher] to [lower] of solvent
    • 18. Only between two solvents
    • 19. Relatively slower (time-dependant process)
    • 20. Is limited to short distances
  • SIMILARITIES
  • 21. Osmosis Concept
    1. Water molecules are always moving about
    2. Net movement of WATER MOLECULES (Solvent) from a solution of [higher] of water to one with [lower] of water
    3. Movement of WATER MOLCULES must be through a PARTIALLY PERMEABLE MEMBRANE
  • 22. Water Potential
    ‘High’ Water Potential
    Instead of using the word concentration for water…
    We use WATER POTENTIAL
    - Water potential is the measure of tendency for water to move from one place to another
    - Water moves from High Water Potential to Low Water Potential
    ‘Low’ Water Potential
  • 23. Osmosis Concept (revised)
    1. Net movement of WATER MOLECULES (Solvent) from a solution of higher concentration of water to one with lower concentration of water
    2. Movement of WATER MOLCULES must be through a PARITALLY PERMEABLE MEMBRANE
    water potential
    water potential
  • 24. Container A (Concentrated Solute Solution)
    20% Water Concentration
    80% Solute Concentration
    Container B (Diluted Solute Solution)
    66.6% Water Concentration
    33.33% Solute Concentration
    Remember Diffusion? Net Movement of particles down a concentration gradient from an area of higher concentration to an area of lower concentration!
    Legend
    Water molecule
    Partially Permeable Membrane
    Solute molecule
  • 25. It’s about the Word Play
    A
    B
    80% sucrose
    20% water
    20% sucrose
    80% water
    Net
    Concentrated Solution (Sucrose for example)
    Low Water Potential
    Low concentration of Solvent
    High concentration of Solute
    Hypertonic compared to B
    Dilute Solution
    High Water Potential
    High Concentration of Solvent
    Low Concentration of Solute
    Hypotonic compared to A
  • 26. MISCONCEPTIONS
  • 27.
  • 28. To Recall…HERE ARE THE ACTIVITIES
  • 29. POE
    Spot the errors!
    Semi-Permeable Membrane
    A
    10% sucrose solution
    B
    20% sucrose solution
    “Osmosis taking place via the uni-direction movement of water molecules from A to B”
    Solution A is hypertonic solution
    Solution B is hypotonic solution
  • 30. Spot the errors!
    Semi-Permeable Membrane
    A
    10% sucrose solution
    “Osmosis taking place via the uni-direction movement of water molecules from A to B”
    A
    10% sucrose solution
    B
    20% sucrose solution
    Solution A is hypertonic
    Solution B is hypotonic
    V
    V
  • 31. Misconceptions
    1. Semi-permeable membrane (Partially)
    2. This is a hypertonic solution (need to be relative to something)
    3. Molecules only move from high water potential to low water potential (It’s the net movement, molecules do not stop moving anyway)
  • 32. TECHNIQUE TO OVERCOME MISCONCEPTION(DEMONSTRATION)
     
    2 20 drops of vanilla
     
     
    QUESTION: Will you be able to smell the vanilla that is inside the balloon? Why or why not?
    PURPOSE:
    • Can the students apply the concept of permeability?
    • 33. Dostudents believe that a balloon can be semi-permeable?
    • 34. Do they believethat its semi-permeability will allow them to smell the vanilla through the balloon?
  • QUESTION:
    If freshener is sprayed in the front of the classroom, will the students in the back be able to smell it?
    PURPOSE:
    • Do the students believe that molecules are constantly in motion?
    • 35. Do students believe that molecules want to spread out?
    • 36. Are students aware of the movement of molecules from a high to low concentration?
  • Tick ( / ) for the picture related to osmosis process and tick ( X ) for the picture related to diffusion process.
    Tick ( / ) for the picture related to osmosis process and tick ( X ) for the picture related to diffusion process
    Picture quiz
  • 37. ATP ENERGY
    Water
    ATP energy
    Gas Molecules
    Ink drop in solution
    Blood cell
    Isotonic drink
    Colour gas
    Liquid molecules
    Grape jus
    Fish in hypotonic
  • 38. Movement of substance
    Tonicity
    Movement of molecules
    Semi-permeable membrane
    Syrup drink
    SEMI-PERMEABLE MEMBRANE
    Perfume
    No semi-permeable membrane
    Solid molecules
  • 39. DEFINITION
    Word puzzle
  • 40.
  • 41. THANK YOU
    -KANY-