A student coats different surfaces of similar leaves with petroleum jelly. This prevents water loss through the coated surface. Each leaf has the same surface area.
The table shows the results after one hour.
Table
| Surface coated | Mass lost in g |
|---|---|
| Neither surface | 0.80 |
| Upper surface only | 0.72 |
| Lower surface only | 0.18 |
| Both surfaces | 0.05 |
Which conclusion is best supported by these results?
More water is lost through the upper surface than the lower surface.
Water is lost through the cut edges but not through either surface.
Equal amounts of water are lost through the upper and lower surfaces.
More water is lost through the lower surface than the upper surface.
43 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.