A potato tuber stores starch. When the tuber is planted, new shoots grow from it.
A scientist measures the starch and glucose content of a planted tuber each week for 4 weeks.
The Table shows the results.
Table
| Week | Starch content in g per 100 g\text{g per 100 g}g per 100 g of tuber | Glucose content in g per 100 g\text{g per 100 g}g per 100 g of tuber |
|---|---|---|
| 0 | 18 | 0.4 |
| 1 | 15 | 0.9 |
| 2 | 11 | 1.3 |
| 3 | 8 | 1.1 |
| 4 | 5 | 0.8 |
Describe the changes in the starch content and the glucose content of the tuber.
Explain why the breakdown of starch is important for the growth of the new shoots.
The starch is still being broken down after week 2, but the glucose content decreases.
Suggest why.
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.