O-LevelBiologyRespiration5090/11 · May/June 2013 · Q181 Mark

The graph shows changes in the amount of air in a person's lungs over a period of 30 seconds. [Figure showing a graph of lung volume / dm³ vs. time / s, with sections labelled V, W, X, Y, Z.] Between which time periods is the rate of breathing fastest?

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AV to W

BW to X

CX to Y

DY to Z

✓ Correct answer

A: V to W

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2013 Paper 1 Variant 1, question 18.

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