Gas and solution exchange

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  1. Define the following words


    The movement of particles from an area of high concentration to an area of low concentration, through a semi-permeable membrane until equilibrium is reached.
  2. Osmosis

    The diffusion of water molecules, from an area of high water concentration to an area of low water concentration, through a semi-permeable membrane.
  3. Active transplant

    The movement of mineral ions and molecules from an area of low concentration to an area of high concentration, through a semi-permeable membrane, using energy
  4. How is Gas exchanged in plants?
    The stomata, found in the lower epidermis, controls the gas exchange. carbon dioxide diffuses into the cell and oxygen and water vapour diffuses out of the cell. The opening and closing of the stomata is controlled by guard cells.When the plant has lots of water the guard cells go turgid and makes the stomata open so gases are exchanged. When the plant has little water, the guard cells become flaccid and close the stomata. This minimises the amount of water vapour escaping.
  5. Draw the guard cells and label the stomata.
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  6. How is Gas exchanged in humans
    How are exchange surfaces adapted to maximise effectiveness
    Diffusion through cell membrane 
    Active transplant
Card Set
Gas and solution exchange
Biology unit 2 topic on gas exchange in plants and animals
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