Potato tubers are stored in darkness. A student measures the mass of starch in samples of the tubers at different times.
| Time in storage (weeks) | Mass of starch (g per 100 g tuber) |
|---|---|
| 0 | 17.0 |
| 2 | 16.6 |
| 4 | 16.2 |
| 6 | 15.8 |
Describe the pattern in the results. Explain why the mass of starch changes and predict what would happen to it if the tubers remained in darkness for two more weeks.
68 exam-style questions on AQA GCSE Biology 4.1 Photosynthesis, covering 4.1.1 Photosynthetic reaction, 4.1.2 Rate of photosynthesis, and 4.1.3 Uses of glucose from photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.