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How substances  get in and out of cells   Mainly based on the exercises from http://www.biology-resources.com/biology-ques...
 
Which one of the following is the best definition of  osmosis ?  <ul><li>(i) The movement of water from a concentrated sol...
Which one of the following is the best definition of  osmosis ?  <ul><li>(i) The movement of water from a concentrated sol...
Which of the statements is an acceptable description of  diffusion ?   (i) The movement of water from a concentrated solut...
Which of the statements is an acceptable description of  diffusion ?   (i) The movement of water from a concentrated solut...
Definition of  osmosis
Definition of  osmosis   <ul><li>‘ The movement of  water   </li></ul><ul><li>from a  concentrated  solution to a  dilute ...
Description of  diffusion
Description of  diffusion   <ul><li>‘ The movement of a  substance </li></ul><ul><li>from a  concentrated  solution to a  ...
Active transport
Active transport <ul><li>Movement of materials across the cell membrane requiring the use of  energy .  </li></ul><ul><li>...
<ul><li>http://www.bio.miami.edu/~cmallery/150/memb/membranes.htm </li></ul>
<ul><li>The diagram shows a vessel which contains a concentrated and a dilute solution separatedby a  partially permeable ...
<ul><li>The diagram shows a vessel which contains a concentrated and a dilute solution separatedby a  partially permeable ...
<ul><li>Make two drawings to show how this cell would appear if it were to be immersed for a few minutes in a solution wit...
(a) a lower osmotic potential (water potential) than its own cytoplasm  Plasmolysis (b) a higher osmotic potential (water ...
<ul><li>                 plasmolysis  -loss of cytoplasmic structure due to water loss  </li></ul><ul><li>                ...
When meat is salted, bacteria cannot grow on it. Suggest a reason for this.
When a cell is respiring  aerobically, which two gases are likely to be  diffusing in and out of the cell, and in which di...
<ul><li>The graphs (a) to (d) represent the concentration of certain substances as measured inside and outside a cell. Mat...
<ul><li>The graphs (a) to (d) represent the concentration of certain substances as measured inside and outside a cell. Mat...
Flashcards to review IGCSE <ul><li>http://www.proprofs.com/flashcards/story.php?title=igcse-biology-all-topics </li></ul>
water and iodine starch and glucose solutions A piece of dialysis (‘Visking’) tubing is knotted at one end  water and iodi...
Keys: <ul><li>Lugol's  iodine solution  solution (which is actually IKI) is a brown solution which turns black in the pres...
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Igcse2010 -osmosis & diffusion

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Osmosis & diffusion.
IGCSE

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Transcript of "Igcse2010 -osmosis & diffusion"

  1. 1. How substances get in and out of cells Mainly based on the exercises from http://www.biology-resources.com/biology-questions.html IGCSE Revision Questions http://biodeluna.wordpress.com
  2. 3. Which one of the following is the best definition of osmosis ? <ul><li>(i) The movement of water from a concentrated solution to a dilute solution across a </li></ul><ul><li>partially permeable membrane. . </li></ul><ul><li>(ii) The movement of a dissolved substance from a concentrated solution to a dilute </li></ul><ul><li>solution across a partially permeable membrane. </li></ul><ul><li>(iii) The movement of water from a dilute solution to a concentrated solution across a partially </li></ul><ul><li>permeable membrane. </li></ul><ul><li>(iv) The uptake of water by a living cell. </li></ul>
  3. 4. Which one of the following is the best definition of osmosis ? <ul><li>(i) The movement of water from a concentrated solution to a dilute solution across a </li></ul><ul><li>partially permeable membrane. . </li></ul><ul><li>(ii) The movement of a dissolved substance from a concentrated solution to a dilute </li></ul><ul><li>solution across a partially permeable membrane. </li></ul><ul><li>(iii) The movement of water from a dilute solution to a concentrated solution across a partially </li></ul><ul><li>permeable membrane. </li></ul><ul><li>(iv) The uptake of water by a living cell. </li></ul>
  4. 5. Which of the statements is an acceptable description of diffusion ? (i) The movement of water from a concentrated solution to a dilute solution across a partially permeable membrane. . (ii) The movement of a dissolved substance from a concentrated solution to a dilute solution across a partially permeable membrane. (iii) The movement of water from a dilute solution to a concentrated solution across a partially permeable membrane. (iv) The uptake of water by a living cell.
  5. 6. Which of the statements is an acceptable description of diffusion ? (i) The movement of water from a concentrated solution to a dilute solution across a partially permeable membrane. . (ii) The movement of a dissolved substance from a concentrated solution to a dilute solution across a partially permeable membrane. (iii) The movement of water from a dilute solution to a concentrated solution across a partially permeable membrane. (iv) The uptake of water by a living cell.
  6. 7. Definition of osmosis
  7. 8. Definition of osmosis <ul><li>‘ The movement of water </li></ul><ul><li>from a concentrated solution to a dilute solution across a partially permeable membrane'. </li></ul>
  8. 9. Description of diffusion
  9. 10. Description of diffusion <ul><li>‘ The movement of a substance </li></ul><ul><li>from a concentrated solution to a dilute solution' </li></ul>
  10. 11. Active transport
  11. 12. Active transport <ul><li>Movement of materials across the cell membrane requiring the use of energy . </li></ul><ul><li>It moves a solute against a concentration gradient </li></ul><ul><li>http://media.pearsoncmg.com/bc/bc_campbell_biology_7/media/interactivemedia/activities/load.html?7&F </li></ul>
  12. 13. <ul><li>http://www.bio.miami.edu/~cmallery/150/memb/membranes.htm </li></ul>
  13. 14. <ul><li>The diagram shows a vessel which contains a concentrated and a dilute solution separatedby a partially permeable membrane. Draw a similar diagram to show the liquid levels after an hour or two. </li></ul>concentrated solution dilute solution
  14. 15. <ul><li>The diagram shows a vessel which contains a concentrated and a dilute solution separatedby a partially permeable membrane. Draw a similar diagram to show the liquid levels after an hour or two. </li></ul>concentrated solution dilute solution
  15. 16. <ul><li>Make two drawings to show how this cell would appear if it were to be immersed for a few minutes in a solution with... </li></ul>(a) a lower osmotic potential (water potential) than its own cytoplasm (b) a higher osmotic potential (water potential) than its own cytoplasm.
  16. 17. (a) a lower osmotic potential (water potential) than its own cytoplasm Plasmolysis (b) a higher osmotic potential (water potential) than its own cytoplasm.
  17. 18. <ul><li>                plasmolysis -loss of cytoplasmic structure due to water loss  </li></ul><ul><li>                 turgidity - swollen cells due to water gain </li></ul>
  18. 19. When meat is salted, bacteria cannot grow on it. Suggest a reason for this.
  19. 20. When a cell is respiring aerobically, which two gases are likely to be diffusing in and out of the cell, and in which direction will they be diffusing?
  20. 21. <ul><li>The graphs (a) to (d) represent the concentration of certain substances as measured inside and outside a cell. Match the following descriptions to the most appropriate graph. </li></ul><ul><li>(i) A substance which the cell is producing and is expelled by active transport. </li></ul><ul><li>(ii) A substance which the cell is using and is taken up by active transport. </li></ul><ul><li>(iii) A substance which the cell is using and can diffuse freely through the cell membrane. </li></ul><ul><li>(iv) A substance which the cell is producing and is free to diffuse across the cell membrane. </li></ul>
  21. 22. <ul><li>The graphs (a) to (d) represent the concentration of certain substances as measured inside and outside a cell. Match the following descriptions to the most appropriate graph. </li></ul><ul><li>(i) A substance which the cell is producing and is expelled by active transport. </li></ul><ul><li>(ii) A substance which the cell is using and is taken up by active transport. </li></ul><ul><li>(iii) A substance which the cell is using and can diffuse freely through the cell membrane. </li></ul><ul><li>(iv) A substance which the cell is producing and is free to diffuse across the cell membrane. </li></ul>(i) (ii) (iii) (iv)
  22. 23. Flashcards to review IGCSE <ul><li>http://www.proprofs.com/flashcards/story.php?title=igcse-biology-all-topics </li></ul>
  23. 24. water and iodine starch and glucose solutions A piece of dialysis (‘Visking’) tubing is knotted at one end water and iodine and filled with a 2 % starch solution mixed with a 10% glucose solution. The tube is immersed in.a test-tube of water to which iodine has been added. (a ) Predict what you will see after 30 minutes (i) in the starch and glucose solutions dialysis tube, (ii) in the test-tube, (iii) when you boil the liquid from the test-tube with Benedict's solution. (b) Give an explanation of these results.
  24. 25. Keys: <ul><li>Lugol's iodine solution solution (which is actually IKI) is a brown solution which turns black in the presence of starches . </li></ul><ul><li>Benedict's solution is used to detect the presence of simple sugars such as glucose . When a simple sugar is mixed in Benedict's solution and heated for a short period of time in a test tube, it goes through a variety of color changes, eventually ending as an orange-red or brick red color. </li></ul><ul><li>Starch is not dissolved in cold water </li></ul>http://answers.yahoo.com/question/index?qid=20070425200251AAx4Alk http://biology.arizona.edu/sciconn/lessons/mccandless/reading.html
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