A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2013 · Q231 Mark
A student used a potometer to measure the rate of water loss from a plant by transpiration. The internal diameter of the capillary tube and the distance moved by the bubble in 30 seconds were recorded. The results are shown in the table. [Figure 23.1] The volume of water moved = πr² x distance moved by the bubble. Which calculation correctly shows how to determine the rate of transpiration in mm³s⁻¹?
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.
Aπ(1.8² × 40.0) / 30
Bπ(1.8² × 40.0) × 30
C30 / π(0.9² × 40.0)
Dπ(0.9² × 40.0) / 30
✓ Correct answer
D: π(0.9² × 40.0) / 30
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Transport in plants and see which topics are most likely to come up next.
Sign up free →