This document discusses the differences and similarities between diffusion and osmosis. Diffusion involves the net movement of particles from an area of higher concentration to lower concentration without a membrane. Osmosis requires a semi-permeable membrane and involves the net movement of water molecules from an area of higher water potential to lower water potential. Both processes aim to evenly distribute particles or solvent, but diffusion can occur over longer distances while osmosis is limited by the membrane. Common misconceptions about these processes are also addressed.

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??

6. comparison

7. DIFFERENCESDIFFUSIONOSMOSISNature of transport ( no membrane required)

8. Flow from [higher] to [lower] of solute

9. Flow from [lower] to [higher] of solvent

10. Between gas molecules, solid-liquid or liquid-gas

11. Relatively faster

12. Can spread over long distance

13. Nature of transport (presence of a semi-permeable membrane)

14. Flow from [lower] to [higher] of solute

15. Flow from [higher] to [lower] of solvent

16. Only between two solvents

17. Relatively slower (time-dependant process)

18. Is limited to short distancesSIMILARITIES

19. 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

20. 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

21. 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

22. 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

23. 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

24. MISCONCEPTIONS

26. To Recall…HERE ARE THE ACTIVITIES

27. 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

28. 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

29. 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)

30. 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?

31. Dostudents believe that a balloon can be semi-permeable?

32. 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?

33. Do students believe that molecules want to spread out?

34. 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

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

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

37. DEFINITIONWord puzzle

39. THANK YOU -KANY-