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ICT IN BIOLOGY<br />DIFFUSION VSOSMOSIS<br />
YAASHINI A/P SELVARAJAH			D20091034837<br /> NATASHA KAUR A/P MINDAR SINGH		D20091034839<br />AMARPREET KAUR A/ GURNAM SIN...
What???How???Differences???Similarities????HOW?WHATZ TAT???DIFFERENCES?<br />Any ideas??<br />
EXAMPLES<br />
EXAMPLES<br />
comparison<br />
DIFFERENCES<br />DIFFUSION<br />OSMOSIS<br /><ul><li>Nature of transport (presence of a semi-permeable membrane)
 Flow from [higher] to [lower] of solute
Flow from [lower] to [higher] of solvent
Between gas molecules, solid-liquid or liquid-gas
Relatively faster
Can spread over long distance
Nature of transport ( no such membrane required )
Flow from [lower] to [higher] of solute
Flow from [higher] to [lower] of solvent
Only between two solvents
Relatively slower (time-dependant process)
Is limited to short distances</li></li></ul><li>SIMILARITIES<br />
Osmosis Concept<br />1. Water molecules are always moving about<br />2. Net movement of WATER MOLECULES (Solvent) from a s...
Water Potential<br />‘High’ Water Potential<br />Instead of using the word concentration for water… <br />We use WATER POT...
Osmosis Concept (revised)<br />1. Net movement of WATER MOLECULES (Solvent) from a solution of higher concentration of wat...
Container A (Concentrated Solute Solution)<br />20% Water Concentration <br />80% Solute Concentration<br />Container B (D...
It’s about the Word Play<br />A<br />B<br />80% sucrose <br />20% water<br />20% sucrose <br />80% water<br />Net<br />Con...
MISCONCEPTIONS<br />
To Recall…HERE ARE THE ACTIVITIES<br />
POE<br />Spot the errors!<br />Semi-Permeable Membrane<br />A<br />10% sucrose solution<br />B<br />20% sucrose solution<b...
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Diffusion Vs Osmosis

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MISCONCEPTION IN BIOLOGY
DIFFUSION VS OSMOSIS

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Diffusion Vs Osmosis

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

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