The table below shows information about four different strains of cube-shaped bacteria, listed in order of increasing size.
| Organism | Side length (μm\mu\text{m}μm) | Surface area (μm2\mu\text{m}^2μm2) | Volume (μm3\mu\text{m}^3μm3) | Surface area to volume ratio |
|---|---|---|---|---|
| A (Smallest) | 1 | 6 | 1 | 6 : 1 |
| B | 2 | 24 | 8 | 3 : 1 |
| C | 5 | 150 | 125 | YYY : 1 |
| D (Largest) | 10 | 600 | 1000 | 0.6 : 1 |
Calculate the value of YYY in the table.
Describe the relationship between the size of the organism 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.