The table below shows information about four different sizes of cube-shaped agar blocks, which were prepared to model how cell size affects diffusion.
| Agar block | Side length (mm\text{mm}mm) | Surface area (mm2\text{mm}^2mm2) | Volume (mm3\text{mm}^3mm3) | Surface area to volume ratio |
|---|---|---|---|---|
| A (Smallest) | 2 | 24 | 8 | 3 : 1 |
| B | 4 | 96 | 64 | 1.5 : 1 |
| C | 8 | 384 | 512 | YYY : 1 |
| D (Largest) | 16 | 1536 | 4096 | 0.375 : 1 |
Calculate the value of YYY in the table.
Describe the relationship between the size of the agar block and its surface area to volume ratio.
30 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.