DP Biology (last assessment 2024)
Question 18M.3.HL.TZ2.a
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ2.a |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
18M.3.HL.TZ2.a
The graph shows the effect of relative humidity on the transpiration rate in Chinese privet (Ligustrum sinense).
The rate of water uptake was measured using the potometer shown in the diagram. The diameter of the capillary tube is 1 mm.
Outline how the rate of water uptake is recorded in this potometer.
[2]
Markscheme
a. measure distance «of movement» of air bubble/water in capillary tube
b. multiply by cross section of capillary
c. record/divide by time elapsed
Allow any other valid method.
