A biologist measures two growth stages of a multicellular aquatic animal.
| growth stage | outer surface area (mm2\mathrm{mm^2}mm2) | volume (mm3\mathrm{mm^3}mm3) | maximum distance of a cell from the outer surface (mm\mathrm{mm}mm) |
|---|---|---|---|
| juvenile | 300 | 100 | 0.5 |
| adult | 1200 | 800 | 1.0 |
Calculate the surface area to volume ratio for each growth stage.
Give each ratio in its simplest form.
Explain which growth stage is more likely to require a transport system.
102 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.