Cactus plants grow in hot deserts. Woodland plants grow in cool, shaded forests.
The Table shows some features of a cactus and a woodland plant.
Table
| Feature | Cactus | Woodland plant |
|---|---|---|
| leaves | narrow spines | large and flat |
| cuticle | very thick | thin |
| number of stomata per mm2\text{mm}^2mm2 | 15 | 150 |
| time when stomata are open | at night | during the day |
Explain how having leaves that are narrow spines helps the cactus to survive in a hot desert.
Explain how the very thick cuticle helps the cactus to survive in a hot desert.
The stomata of the cactus open at night.
Explain how this helps the cactus to survive in a hot desert.
Suggest one disadvantage to the cactus of having fewer stomata than the woodland plant.
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.