February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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26Human Reproduction Sex HormonesEasy1 mark
The diagram shows the relative concentrations of two hormones that are involved in controlling the human menstrual cycle.
Graph of concentration of hormone against time from 0 to 28 days for two hormones: a solid line with a small peak at day 14, and a dashed line labelled X with a large sharp peak at day 14
Which hormone is represented by X?