A student investigates water loss from leaves.
The Table shows her results.
Table
| Leaf | Surface covered with petroleum jelly | Mass at start in g\text{g}g | Mass after 24 hours in g\text{g}g | Percentage loss in mass |
|---|---|---|---|---|
| A | none | 5.00 | 4.15 | |
| B | upper surface | 5.20 | 4.42 | 15.0 |
| C | lower surface | 4.80 | 4.66 | 2.9 |
| D | both surfaces | 5.00 | 4.95 | 1.0 |
Name the process by which water is lost from the leaves of a plant.
Calculate the percentage loss in mass of leaf A.
Explain why the student calculated the percentage loss in mass, and not just the loss in mass.
Explain why leaf C lost much less mass than leaf B.
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.