Scientists compare four basil varieties. The leaves have the same surface area and the same number of open stomata.
| Variety | Mean leaf thickness / mm | Spongy mesophyll occupied by air spaces / % |
|---|---|---|
| K | 0.20 | 40 |
| L | 0.20 | 20 |
| M | 0.40 | 40 |
| N | 0.40 | 20 |
Which variety should allow carbon dioxide to reach photosynthesising cells most rapidly?
Variety K
Variety L
Variety M
Variety N
80 exam-style questions on Edexcel GCSE Biology 6.2 Transport in plants, covering 6.2.1 Root hair cell adaptations, 6.2.2 Structure of xylem and phloem, 6.2.3 Transpiration and stomata, 6.2.4 Translocation of sucrose, 6.2.5 Leaf structure for photosynthesis, 6.2.6 Environmental factors on water uptake, 6.2.7 Rate calculations for transpiration, and 6.2.8 Plant adaptations to extreme environments. Each one has a worked solution and a mark scheme showing where the marks go.