O-LevelBiologyCoordination & Response5090/12 · Oct/Nov 2017 · Q361 Mark

The diagram shows the changes in thickness of the uterus lining during one menstrual cycle. When would the levels of progesterone and LH be highest? [Figure 36.1]

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Aprogesterone: between day 12 and 16, LH: between day 25 and 28

Bprogesterone: between day 19 and 23, LH: on day 14

Cprogesterone: on day 5, LH: between day 1 and 5

Dprogesterone: on day 13, LH: on day 10

✓ Correct answer

B: progesterone: between day 19 and 23, LH: on day 14

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2017 Paper 1 Variant 2, question 36.

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