DP Biology (first assessment 2025)

Test builder »

Question 19M.1B.SL.TZ1.c

Select a Test
Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.1B.SL.TZ1.c
Level SL Paper 1B Time zone TZ1
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.1B.SL.TZ1.c

One criticism of the experiment is that it only measured the rate of transpiration indirectly. Explain how the experiment is an indirect measurement of transpiration.

[2]

Markscheme

a. transpiration is water evaporating from «the leaves of» a plant ✔ 

b. what is being measured is water uptake to the plant ✔ 

c. assumes no water used for other processes/photosynthesis ✔

This is not about water loss from apparatus

Examiners report

This item was rarely answered well, with many candidates simply describing what would happen in a potometer. An ability to outline limitations, assumptions and possible errors shows the ability to evaluate, and is one of the objectives of the DP Biology course. A similar question on the limitations of the potometer last year was also answered poorly.

Syllabus sections