Igcse Model Questions Vol1 2017 Biology Question 32
Practice objective / multiple choice question 32 from the 2017 Igcse Model Questions Vol1 Biology examination.
In a 28‑day menstrual cycle, the concentration of estrogen (E) rises linearly from \(20\,\text{pg mL}^{-1}\) on day 1 to \(300\,\text{pg mL}^{-1}\) on day 14, then falls linearly to \(50\,\text{pg mL}^{-1}\) on day 28. The luteinising hormone (LH) surge begins as soon as the estrogen level exceeds \(250\,\text{pg mL}^{-1}\) and lasts 48 h. On which day does the LH surge start?
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This is Igcse Model Questions Vol1 2017 Biology Question 32. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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