The table shows the surface area and volume of three organisms.
Table
| Organism | Surface area in mm2\text{mm}^2mm2 | Volume in mm3\text{mm}^3mm3 |
|---|---|---|
| Amoeba | 0.03 | 0.0001 |
| Flatworm | 150 | 50 |
| Mouse | 6000 | 20 00020\,00020000 |
Which conclusion is supported by the data?
The flatworm has the largest surface area : volume ratio, so it needs a transport system.
The amoeba has the smallest surface area, so it needs a specialised gas exchange surface.
The mouse has the largest surface area, so diffusion across its skin meets all of its needs.
The mouse has the smallest surface area : volume ratio, so it needs a transport system.
114 exam-style questions on OCR GCSE Biology 2.2 The challenges of size, covering 2.2.1 Exchange surfaces and surface area : volume ratio, 2.2.2 Substances transported in organisms, 2.2.3 The human circulatory system, 2.2.4 The heart and blood vessels, 2.2.5 Red blood cells and plasma, 2.2.6 Uptake of water and mineral ions by plants, 2.2.7 Transpiration and translocation, 2.2.8 Xylem and phloem, 2.2.9 Environmental factors and water uptake, and 2.2.10 Using a potometer. Each one has a worked solution and a mark scheme showing where the marks go.