Describe the process of diffusion, including examples
Explain how diffusion is affected by different factors
Define and explain “surface area to volume ratio”, and how this relates to single-celled and multicellular organisms (inc calculations)
Explain how the effectiveness of an exchange surface can be increased, inc examples of adaptations for small intestines, lungs, gills roots & leaves
Describe the process of osmosis (inc calculation of water uptake & percentage gain and loss of mass of plant tissue)
Required practical 3: investigate the effect of a range of concentrations of salt or sugar solutions on the mass of plant tissue
Describe the process of active transport, including examples – gut and roots
Explain the differences between diffusion, osmosis and active transport
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