Biology · Oct / Nov 2020 · Paper 11 · Question 36

The diagram shows a calendar for 33 days in February and March. 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?

1. A5–12 February
2. B13–19 February
3. C20–26 February
4. D27 February – 5 March

As printed in the paper