O-LevelBiologyCoordination & Response5090/11 · Oct/Nov 2020 · Q361 Mark

The diagram shows a calendar for 33 days in February and March. [Figure 36.1] A girl, who has a regular menstrual cycle of 28 days, begins menstruation on 5 February. During which dates would the progesterone concentration in her blood rise most rapidly?

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A5-12 February

B13-19 February

C20-26 February

D27 February – 5 March

✓ Correct answer

C: 20-26 February

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2020 Paper 1 Variant 1, question 36.

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