Igcse Model Questions Vol1 2020 Biology Question 3

Practice objective / multiple choice question 3 from the 2020 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2020 Biology Objective / Multiple Choice Medium Difficulty
Question 3 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • objective

A woman monitors her urinary luteinising hormone (LH) levels each day. The recorded values (IU L\(^{-1}\)) are: Day 10: 5 Day 11: 8 Day 12: 14 Day 13: 18 Day 14: 22 Day 15: 12 Day 16: 6 An LH surge is defined as a level ≥ 15 IU L\(^{-1}\) and ovulation occurs 24-36 hours after the first surge reading. (a) Identify the day on which the LH surge first begins. (b) Estimate the most likely day of ovulation. (c) State the five‑day fertile window (the five days ending on the day of ovulation).

Answer Options

A. The LH surge begins on Day 12; ovulation is most likely on Day 13; the five‑day fertile window is Days 9-13.
B. The LH surge begins on Day 13; ovulation is most likely on Day 15; the five‑day fertile window is Days 11-15.
C. The LH surge begins on Day 14; ovulation is most likely on Day 15; the five‑day fertile window is Days 12-16.
Correct Answer D. The LH surge begins on Day 13; ovulation is most likely on Day 14; the five‑day fertile window is Days 10-14.
Correct Answer
D
Correct Option:
The LH surge begins on Day 13; ovulation is most likely on Day 14; the five‑day fertile window is Days 10-14.

About This Question

This is Igcse Model Questions Vol1 2020 Biology Question 3. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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