This document discusses the differences and similarities between diffusion and osmosis. It begins by introducing the group members working on the topic. Then, it provides examples and comparisons of diffusion and osmosis. The main differences are that diffusion involves transport across no membrane, while osmosis requires a semi-permeable membrane. Osmosis also involves the movement of water, while diffusion can involve any molecules or ions. Their similarities are that both involve the passive transport of substances from an area of higher concentration to lower concentration. The document then discusses misconceptions students may have and provides activities to help overcome them, such as using demonstrations involving semi-permeable membranes.

1. ICT IN BIOLOGYDIFFUSION VSOSMOSIS

2. YAASHINI A/P SELVARAJAH D20091034837 NATASHA KAUR A/P MINDAR SINGH D20091034839AMARPREET KAUR A/ GURNAM SINGH D20091034873 KRISNAVIMALA A/P KRISHUAN D20091034821 Group members

3. What???How???Differences???Similarities????HOW?WHATZ TAT???DIFFERENCES?Any ideas??

5. EXAMPLES

7. EXAMPLES

8. comparison

9. DIFFERENCESDIFFUSIONOSMOSISNature 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 distancesSIMILARITIES

21. Osmosis Concept1. Water molecules are always moving about2. Net movement of WATER MOLECULES (Solvent) from a solution of [higher] of water to one with [lower] of water3. Movement of WATER MOLCULES must be through a PARTIALLY PERMEABLE MEMBRANE

22. Water Potential‘High’ Water PotentialInstead 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 water2. Movement of WATER MOLCULES must be through a PARITALLY PERMEABLE MEMBRANEwater potentialwater potential

24. Container A (Concentrated Solute Solution)20% Water Concentration 80% Solute ConcentrationContainer B (Diluted Solute Solution)66.6% Water Concentration 33.33% Solute ConcentrationRemember Diffusion? Net Movement of particles down a concentration gradient from an area of higher concentration to an area of lower concentration!LegendWater moleculePartially Permeable MembraneSolute molecule

25. It’s about the Word PlayAB80% sucrose 20% water20% sucrose 80% waterNetConcentrated Solution (Sucrose for example)Low Water PotentialLow concentration of SolventHigh concentration of SoluteHypertonic compared to BDilute SolutionHigh Water PotentialHigh Concentration of SolventLow Concentration of SoluteHypotonic compared to A

26. MISCONCEPTIONS

28. To Recall…HERE ARE THE ACTIVITIES

29. POESpot the errors!Semi-Permeable MembraneA10% sucrose solutionB20% sucrose solution“Osmosis taking place via the uni-direction movement of water molecules from A to B”Solution A is hypertonic solutionSolution B is hypotonic solution

30. Spot the errors!Semi-Permeable MembraneA10% sucrose solution“Osmosis taking place via the uni-direction movement of water molecules from A to B”A10% sucrose solutionB20% sucrose solutionSolution A is hypertonicSolution B is hypotonicVV

31. Misconceptions1. 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 processPicture quiz

37. ATP ENERGYWaterATP energy Gas MoleculesInk drop in solutionBlood cellIsotonic drinkColour gasLiquid moleculesGrape jusFish in hypotonic

38. Movement of substanceTonicityMovement of moleculesSemi-permeable membraneSyrup drinkSEMI-PERMEABLE MEMBRANEPerfumeNo semi-permeable membrane Solid molecules

39. DEFINITIONWord puzzle

41. THANK YOU -KANY-