O-LevelBiologyCell Biology5090/11 · May/June 2017 · Q31 Mark
A student cuts out four cylinders of potato. Each cylinder is 30mm long. The cylinders are all of the same diameter. The potato cylinders are placed in sugar solutions of different concentrations. After one hour, the lengths of the cylinders are measured again. The results are shown in the table. Which sugar solution has a water potential closest to that of the potato cells?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Aconcentration of sugar / mol per dm³: 0.1, starting length /mm: 30, length after one hour/mm: 33
Bconcentration of sugar / mol per dm³: 0.3, starting length /mm: 30, length after one hour/mm: 31
Cconcentration of sugar / mol per dm³: 0.4, starting length /mm: 30, length after one hour/mm: 27
Dconcentration of sugar / mol per dm³: 0.5, starting length /mm: 30, length after one hour/mm: 26
✓ Correct answer
B: concentration of sugar / mol per dm³: 0.3, starting length /mm: 30, length after one hour/mm: 31
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Cell Biology and see which topics are most likely to come up next.
Sign up free →