Transport in cells

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