Igcse Model Questions Vol1 2023 Biology Question 10
Practice objective / multiple choice question 10 from the 2023 Igcse Model Questions Vol1 Biology examination.
Estrogen is secreted by the ovarian follicle at a constant rate of \(25\) µg day\(^{-1}\). It is removed from the bloodstream with a first‑order rate constant of \(0.15\) day\(^{-1}\). An LH surge is triggered when the estrogen concentration reaches \(150\) µg. If the initial estrogen concentration is zero, after how many days will the concentration reach the threshold? (Use \(C(t)=\frac{R}{k}\bigl(1-e^{-kt}\bigr)\).)
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This is Igcse Model Questions Vol1 2023 Biology Question 10. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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