A student uses a potometer to measure the rate of water uptake by a leafy shoot at different temperatures. All other conditions are kept the same.
The Table shows the results.
Table
| Temperature in ∘C^\circ\text{C}∘C | Rate of water uptake in mm3\text{mm}^3mm3 per minute |
|---|---|
| 10 | 4 |
| 15 | 7 |
| 20 | 11 |
| 25 | 16 |
| 30 | 22 |
| 35 | 13 |
Describe the relationship between temperature and the rate of water uptake from 10 ∘C10\ ^\circ\text{C}10 ∘C to 30 ∘C30\ ^\circ\text{C}30 ∘C.
Use data from the Table in your answer.
Explain why increasing the temperature increases the rate of water uptake.
At 35 ∘C35\ ^\circ\text{C}35 ∘C the rate of water uptake is lower.
Suggest why.
The student repeats the experiment at 25 ∘C25\ ^\circ\text{C}25 ∘C in the dark.
Predict and explain the effect on the rate of water uptake.
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.