MOVEMENT OF SUBSTANCES OSMOSIS AND DIFFUSION Presented by Mary Anne Cristobal Biology
This is what happened… Area of  high  concentration Area of  low  concentration
RECALL <ul><li>Diffusion is the _________________ of ___________  of substances from _________ concentration to __________...
EXAMPLES OF DIFFUSION <ul><li>Diffusion in Gas </li></ul><ul><ul><li>Spraying of perfume </li></ul></ul><ul><ul><li>Vapor ...
DIFFUSION IN LIQUIDS
DIFFUSION IN LIVING ORGANISMS <ul><li>Diffusion is the main process by which organisms obtain useful substances like oxyge...
DIFFUSION IS A PASSIVE TRANSPORT Diffusion
OSMOSIS <ul><li>Osmosis a special kind of diffusion. </li></ul><ul><li>It involves the MOVEMENT of WATER MOLECULES ONLY an...
PARTIALLY PERMEABLE MEMBRANE <ul><li>Membrane with  small holes . </li></ul><ul><li>Allows some molecules to pass through,...
WHAT IS WATER POTENTIAL? <ul><li>It is used to describe an environment whether it is DILUTE or CONCENTRATED. </li></ul><ul...
DIFFUSION THROUGH A PARTIALLY PERMEABLE MEMBRANE (Diffusion of glucose molecules) starch   glucose
CONCENTRATED AND DILUTE SOLUTION <ul><li>Which of the two is  more concentrated  in terms of solute (sugar)? </li></ul><ul...
What molecules are moving now? water molecules starch
QUESTIONS <ul><li>Can the water molecules move across the membrane? </li></ul><ul><li>Can the starch molecules move across...
OSMOSIS <ul><li>What does the lettuce leaf looked like before it was place in the water? </li></ul><ul><li>What happened t...
<ul><li>In the beginning, which of the two has the higher water potential? </li></ul><ul><li>What is the movement of the w...
QUICK CHECK
What is osmosis? <ul><li>It is the net movement of __________________ from ____________________ to  ___________________ ac...
CONDITIONS FOR OSMOSIS <ul><li>A presence of partially permeable membrane. </li></ul><ul><li>A region of lower water poten...
GROUP WORK
ASSIGNMENT <ul><li>What do you think will happen if salt water is used to water the plants? </li></ul><ul><li>What will ha...
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Osmosis

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Lecture on Osmosis.

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Osmosis

  1. 1. MOVEMENT OF SUBSTANCES OSMOSIS AND DIFFUSION Presented by Mary Anne Cristobal Biology
  2. 2. This is what happened… Area of high concentration Area of low concentration
  3. 3. RECALL <ul><li>Diffusion is the _________________ of ___________ of substances from _________ concentration to ______________ concentration. </li></ul>movement molecules higher lower
  4. 4. EXAMPLES OF DIFFUSION <ul><li>Diffusion in Gas </li></ul><ul><ul><li>Spraying of perfume </li></ul></ul><ul><ul><li>Vapor given off by a burnt fish spreading from the kitchen and into the bedroom </li></ul></ul><ul><li>Diffusion in liquids </li></ul><ul><ul><li>Making coffee </li></ul></ul><ul><ul><li>Food coloring and water </li></ul></ul>
  5. 5. DIFFUSION IN LIQUIDS
  6. 6. DIFFUSION IN LIVING ORGANISMS <ul><li>Diffusion is the main process by which organisms obtain useful substances like oxygen and nutrients, and get rid of waste products like carbon dioxide from their cells. </li></ul><ul><li>It is a slow process and DEPENDENT on the CONCENTRATION GRADIENT (higher and lower concentration) and the RANDOM MOVEMENT OF MOLECULES . </li></ul>
  7. 7. DIFFUSION IS A PASSIVE TRANSPORT Diffusion
  8. 8. OSMOSIS <ul><li>Osmosis a special kind of diffusion. </li></ul><ul><li>It involves the MOVEMENT of WATER MOLECULES ONLY and the presence of PARTIALLY PERMEABLE MEMBRANE. </li></ul><ul><li>It is defined as the movement of water molecules from higher water potential to lower water potential across a partially permeable membrane. </li></ul>
  9. 9. PARTIALLY PERMEABLE MEMBRANE <ul><li>Membrane with small holes . </li></ul><ul><li>Allows some molecules to pass through, but not all. </li></ul><ul><li>Example: cell membrane, </li></ul><ul><li>visking tubing </li></ul>
  10. 10. WHAT IS WATER POTENTIAL? <ul><li>It is used to describe an environment whether it is DILUTE or CONCENTRATED. </li></ul><ul><ul><li>DILUTE solution – higher water potential , meaning more water molecules per unit volume </li></ul></ul><ul><ul><li>CONCENTRATED solution – lower water potential , less water molecules per unit volume </li></ul></ul>
  11. 11. DIFFUSION THROUGH A PARTIALLY PERMEABLE MEMBRANE (Diffusion of glucose molecules) starch glucose
  12. 12. CONCENTRATED AND DILUTE SOLUTION <ul><li>Which of the two is more concentrated in terms of solute (sugar)? </li></ul><ul><ul><li>25% sugar solution or 75% sugar solution </li></ul></ul><ul><ul><li>Ans: 75% (concentrated) </li></ul></ul><ul><li>Which of the two has a higher water potential ? </li></ul><ul><ul><li>25% sugar solution or 75% sugar solution </li></ul></ul><ul><ul><li>Ans: 25% (dilute) </li></ul></ul>
  13. 13. What molecules are moving now? water molecules starch
  14. 14. QUESTIONS <ul><li>Can the water molecules move across the membrane? </li></ul><ul><li>Can the starch molecules move across the membrane? </li></ul><ul><li>There were more water molecules at which side at the start of the experiment? </li></ul><ul><li>What happened to the number of water molecules at the end of the experiment? </li></ul>
  15. 15. OSMOSIS <ul><li>What does the lettuce leaf looked like before it was place in the water? </li></ul><ul><li>What happened to the leaf after soaking it in water? </li></ul><ul><li>How was it refreshed? </li></ul><ul><li>Where did the water came from? </li></ul>Video Clip1
  16. 16. <ul><li>In the beginning, which of the two has the higher water potential? </li></ul><ul><li>What is the movement of the water molecules? </li></ul><ul><li>Is the partially permeable membrane present? </li></ul>
  17. 17. QUICK CHECK
  18. 18. What is osmosis? <ul><li>It is the net movement of __________________ from ____________________ to ___________________ across a </li></ul><ul><li>__________________________. </li></ul>Water molecules Higher water potential Lower water potential Partially permeable membrane
  19. 19. CONDITIONS FOR OSMOSIS <ul><li>A presence of partially permeable membrane. </li></ul><ul><li>A region of lower water potential. </li></ul><ul><li>A region of higher water potential . </li></ul>
  20. 20. GROUP WORK
  21. 21. ASSIGNMENT <ul><li>What do you think will happen if salt water is used to water the plants? </li></ul><ul><li>What will happen if we covered the meat with too much salt? </li></ul>

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