O-LevelBiologyGenetics & Variation5090/11 · May/June 2023 · Q321 Mark

The diagram shows the 28 days of a typical menstrual cycle. The letters around the outside indicate different points in the cycle. Which row shows the points in the cycle?

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Amaximum thickness of uterus lining: Z, menstruation: W, ovulation: X

Bmaximum thickness of uterus lining: X, menstruation: U, ovulation: Y

Cmaximum thickness of uterus lining: Z, menstruation: U, ovulation: X

Dmaximum thickness of uterus lining: V, menstruation: X, ovulation: Z

✓ Correct answer

C: maximum thickness of uterus lining: Z, menstruation: U, ovulation: X

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2023 Paper 1 Variant 1, question 32.

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