A technician uses a bubble potometer to record water uptake by a young tomato shoot over two intervals. The lamp is moved closer to the shoot before the second interval.
| Interval | Water uptake in mm3\mathrm{mm^3}mm3 | Time in minutes |
|---|---|---|
| First | 28 | 7 |
| Second | ? | 5 |
During the second interval, the rate of water uptake was 50% greater than during the first interval.
What volume of water was taken up during the second interval?
30 mm330\ \mathrm{mm^3}30 mm3
42 mm342\ \mathrm{mm^3}42 mm3
20 mm320\ \mathrm{mm^3}20 mm3
28 mm328\ \mathrm{mm^3}28 mm3
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.