A biologist models two pieces of living tissue. Their dimensions are shown in the table.
| Tissue | Shape | Dimensions |
|---|---|---|
| A | Cuboid | 9 mm by 3 mm by 1 mm |
| B | Cube | Side length 3 mm |
The two pieces of tissue have the same volume.
Calculate the surface area : volume ratio of tissue A.
Calculate the surface area : volume ratio of tissue B.
Which piece of tissue would have the more efficient exchange surface? Explain your answer.
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.