DP Biology (first assessment 2025)

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Question 19M.1B.SL.TZ2.3c

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.1B.SL.TZ2.3c
Level SL Paper 1B Time zone TZ2
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.1B.SL.TZ2.3c
(c)

Outline how ventilation rate could have been monitored in this study.

[2]

Markscheme

a. «data logging» with spirometer
OR
chest belt ✔

b. «tidal» volume recorded for a given period of time
OR
average «tidal» volume found and multiplied by number breaths per minute ✔

Do not accept confusion with respirometer (measuring oxygen consumption or CO2 release).

Must include a reference to time.

Examiners report

Question (c) was poorly answered. Many candidates thought a respirometer would be used to measure ventilation rate while other candidates gave a description of how to measure the number of breaths per minute. This was considered inadequate as the Y axis of the graph indicated that ventilation rate was volume per minute, so reference to volume and time were required in the response.

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