Two leafy shoots with the same leaf area were tested using a potometer. Shoot A had no leaf hairs and shoot B had leaf hairs. Each shoot was tested in still air and moving air, with temperature and light intensity kept the same.
| Shoot | Rate of water uptake in still air (mm min⁻¹) | Rate of water uptake in moving air (mm min⁻¹) |
|---|---|---|
| A | 2.4 | 4.8 |
| B | 2.0 | 3.0 |
Use the data to compare the increases in water uptake, then explain why the increase is smaller for shoot B.
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.