2(d)
2(d) Movement of substances into and out of cells
3 specification points in sub-topic 2(d).
Specification points
2.152.162.17
2.15: Diffusion, osmosis and active transport
Diffusion, osmosis and active transport compared: direction, membranes and energy.
2.16: Factors affecting movement into and out of cells
How surface area, distance, temperature and concentration gradient affect the rate of exchange.
2.17: Diffusion and osmosis investigations
Practical: diffusion into agar cubes and osmosis in potato pieces.