A student investigated the effect of light intensity on the rate of water uptake by a leafy shoot. Temperature and air movement were kept constant.
The Table shows the results.
Table
| Light intensity in arbitrary units | Rate of water uptake in mm3\text{mm}^3mm3 per minute |
|---|---|
| 0 | 2.0 |
| 2 | 5.5 |
| 4 | 9.0 |
| 6 | 12.0 |
| 8 | 12.4 |
| 10 | 12.5 |
Calculate the percentage increase in the rate of water uptake between light intensities of 0 and 6 arbitrary units.
Explain why the rate of water uptake increases between light intensities of 0 and 6 arbitrary units.
Suggest why the rate of water uptake changes very little above a light intensity of 6 arbitrary units.
Suggest why there is still some water uptake at a light intensity of 0 arbitrary units.
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.