A scientist investigated the rate of net water uptake via osmosis in potato tuber (Solanum tuberosum) discs across different temperatures. The results are shown in the table below:
| Temperature (∘C^{\circ}\text{C}∘C) | Rate of Net Water Uptake (mg cm−2 h−1\text{mg}\,\text{cm}^{-2}\,\text{h}^{-1}mgcm−2h−1) |
|---|---|
| 10 | 120 |
| 20 | 210 |
| 30 | 330 |
| 40 | 360 |
| 50 | 180 |
Explain the change in the rate of net water uptake between 10 ∘C^{\circ}\text{C}∘C and 40 ∘C^{\circ}\text{C}∘C.
Calculate the percentage increase in the rate of net water uptake from 10 ∘C^{\circ}\text{C}∘C to 40 ∘C^{\circ}\text{C}∘C. Show your working.
Cells of potato tubers are sensitive to osmotic changes. Describe an experiment that you could perform to determine the concentration of sucrose solution that is isotonic to the cytoplasm of these plant cells.
You are given:
6 exam-style questions on AQA A Level Biology Transport across cell membranes, covering Transport across cell membranes. Each one has a worked solution and a mark scheme showing where the marks go.