A plant was kept in the same light conditions while its stomatal pore width and rate of water vapour loss were measured before and after watering.
| Measurement | Before watering | After watering |
|---|---|---|
| Mean stomatal pore width (µm) | 1.8 | 5.4 |
| Rate of water vapour loss (mg cm⁻² min⁻¹) | 0.12 | 0.36 |
Explain how watering caused the changes shown in the results.
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.