Question 19M.3.HL.TZ1.2a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.HL.TZ1.2a |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | State | Question number | a | Adapted from | N/A |
A leafy shoot was cut from a plant and connected to a potometer to measure the transpiration rate. The length of the air column in the glass tube was measured using the ruler.
[Source: © International Baccalaureate Organization 2019]
State the function of the tap and reservoir.
[1]
to reset the potometer
OR
move the air column to the right/end
OR
to replace/replenish water in tube ✔
Accept meniscus or air bubble as alternatives to column in all parts of question
All sections of this question revealed that students were unfamiliar with use and set-up of the potometer. This question was also commented on frequently by teachers in the G2 form who noted the absence of reservoirs in some of the potometers used in student labs. However, it was felt that students familiar with the working of any potometer could have used the information in the diagram to answer this question correctly.
