Gas and Solute Exchange
- Created by: Jasmin
- Created on: 07-04-13 18:46
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- Gas and Solute Exchange
- Diffusion
- Particles move from an area of high concentration to an area of low concentration
- Exchange surfaces are ADAPTED to maximise effectiveness
- Thin, short distance to diffuse
- Large SA, lots of substances diffuse at once
- Gas Exchange in plants
- CO2 - diffusion
- Internal air spaces, leaves flattened shape increase SA
- Thin leaves so the distance CO2 has to diffuse from the outside air to photosynthesising cells is small
- Stomata
- Can be opened when the plant needs to allow air into the leaves
- Size controlled by guard cells
- Close stomata if plant is losing water faster than it is being replaced by the roots
- CO2 - diffusion
- Diffusion
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