O-LevelBiologyRespiration5090/12 · Oct/Nov 2021 · Q181 Mark

The graphs show records of a person's breathing at rest and during exercise. [Figure 18.1] What is the increase in breathing rate when the person is at rest and then exercises?

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A9 breaths per minute

B12 breaths per minute

C21 breaths per minute

D60 breaths per minute

✓ Correct answer

A: 9 breaths per minute

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2021 Paper 1 Variant 2, question 18.

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