Figure 4 is a table that shows the surface area (SA) to volume (V) ratio in three different sized cubes - Edexcel - GCSE Biology Combined Science - Question 4 - 2016 - Paper 1

To calculate the surface area to volume ratio (SA:V) for the 2 cm cube, we use the formulas for surface area and volume of a cube:

1. Volume (V): Volume of a cube is calculated as: $V = s^3$ where ( s ) is the side length of the cube. For a cube of size 2 cm: $V = 2^3 = 8 \, \text{cm}^3$

2. Surface Area (SA): The surface area of a cube is calculated as: $SA = 6s^2$ For a cube of size 2 cm: $SA = 6 \times 2^2 = 24 \, \text{cm}^2$

3. SA:V Ratio: Now, we can calculate the SA:V ratio: $SA:V = \frac{SA}{V} = \frac{24 \, \text{cm}^2}{8 \, \text{cm}^3} = 3:1$

Thus, the SA:V ratio for the 2 cm cube is 3:1.