Transport 0.0 / 5 ? BiologyCells, tissues and organsGCSEAQA Created by: fyfejacobCreated on: 08-11-19 19:17 Define diffusion Diffusion is the movement of cells from a high concentration to a low concentration. 1 of 8 Define osmosis Osmosis is the diffusion of water from a dilute solution to a more concentrated solution through a partially permeable membrane. 2 of 8 Define active transport Active transport is when cells use energy to move up the concentration gradient. 3 of 8 Give an example of active transport use in plants. What organelle is needed for this process? Root hair cells use active transport in plants to absorb minerals from soil. 4 of 8 What conditions can speed up diffusion rate? Increased temperature, Increased density of substance and smaller medium. 5 of 8 Explain why alveoli are effective exchange surfaces. Alveoli are effective due to their large total surface area. 6 of 8 Why does a good blood supply speed up exchange? An efficient blood supply can transport molecules to and from the exchange surface quickly. 7 of 8 Where does gas exchange and transpiration happen on a leaf? It normally happens in the stomata, through inter cellular holes on the underside of the leaf. 8 of 8
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