TRIPLE BIO: Gas and Solute Exchange 0.0 / 5 ? BiologyExchange of materialsTriple BiologyGCSEAQA Created by: AngeleSofiaCreated on: 06-06-16 18:57 What is the main difference between diffusion and osmosis? Osmosis involves the movement of water. 1 of 6 How is the amount of oxygen, carbon dioxide and water vapour, that enter and leave the leaf, controlled? Controlled by guard cells, which open and close the stomata to allow or prevent the gasses diffusing in and out. 2 of 6 State the two places where gaseous exchange happens in a leaf. 1. The underside of the leaf. 2. The walls of the cell within a leaf. 3 of 6 Suggest one advantage of leaves having a flattened shape. It increases the surface area so gas exchange is more efficient. 4 of 6 Give four ways in which alveoli are specialised to maximise gas exchange. 1. Large surface area. 2. Thin cell walls. 3. Good blood supply. 4. Moist lining for dissolving gases. 5 of 6 Water absorbed by the roots is lost by what process. Diffusion. 6 of 6
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