A student investigates water movement in parsnip root tissue. Three cylinders are cut from the same parsnip using one cork borer. Each cylinder is weighed and placed in a different sucrose solution.
The student uses the same volume of solution, temperature and immersion time for each cylinder. The cylinders are then removed, blotted and weighed again.
| Sample | Concentration of sucrose solution in mol/dm3\text{mol/dm}^3mol/dm3 | Initial mass in g\text{g}g | Final mass in g\text{g}g | Percentage change in mass |
|---|---|---|---|---|
| P | 0.0 | 1.80 | 2.07 | |
| Q | 0.1 | 1.50 | 1.65 | +10.0 |
| R | 0.2 | 2.50 | 2.70 | +8.0 |
Calculate the missing result for sample P.
Explain the increase in mass recorded for sample P.
Use the data to explain why sample R gains more mass in grams than sample Q but has a smaller percentage change.
Give one detail of the blotting method that must be standardised for all three cylinders.
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.