A researcher compared leaves from two varieties of bean plant. The leaves had the same surface area and were tested at the same temperature and light intensity.
| Bean variety | Spongy mesophyll occupied by air spaces (%) | Carbon dioxide uptake (cm³ per hour) |
|---|---|---|
| R | 36 | 8.4 |
| S | 15 | 5.1 |
Explain how the difference in the spongy mesophyll could account for the carbon dioxide uptake values. Use data from the table.
74 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.