B3.2 Osmosis

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5 Terms

1
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What is osmosis?

  • Net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution), through a partially permeable membrane

<ul><li><p>Net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution), through a partially permeable membrane</p></li></ul><p></p>
2
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What is a dilute solution and what is a concentrated solution?

  • Dilute solution: low concentration of solutes, more water

  • Concentrated solution: high concentration of solutes, less water

3
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What happens when plant cells are placed in a solution of high solute concentration (low water potential)?

  • Water moves out the plant cell by osmosis and becomes flaccid

    • Very concentrated solution: plasmolysed

4
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What happens when plant cells are placed in a solution of low solute concentration (low water potential)?

  • Plant is turgid

5
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What happens when rbc are placed in an isotonic, hypotonic and hypertonic solution respectively?

  • Isotonic: normal

  • Hypotonic: (low solute concentration) haemolysis

  • Hypertonic: (high solute concentration) crenation