A plant nursery stores leafy cuttings before planting. A student places equal areas of leaves in an apparatus that measures water vapour leaving them under different storage conditions.
| Condition | Water-vapour concentration of surrounding air | Air movement | Time in minutes | Water vapour released in mg |
|---|---|---|---|---|
| A | low | still | 6 | 18 |
| B | high | still | 4 | 8 |
| C | low | moving | 5 | 30 |
| D | high | moving | 6 | 18 |
Use the data and your knowledge of transpiration to explain the results and suggest which storage conditions would best limit water loss from the cuttings.
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.