The graph shows how the surface area to volume ratio of a spherical organism changes as its radius increases.
State how the surface area to volume ratio of an organism changes as the organism gets larger.
[1]
Use the graph to determine the surface area to volume ratio when the radius is 2 mm.
[1]
Describe how the surface area to volume ratio changes as the radius increases.
[1]
Below a surface area to volume ratio of about 1.5 : 1 an organism of this shape can no longer meet its needs by diffusion alone. Explain why larger organisms need a specialised exchange surface and a mass transport system.
[3]