Neco 2018 Biology Question 28

Practice objective / multiple choice question 28 from the 2018 Neco Biology examination.

Neco 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 28 NECO • 2018 • BIOLOGY • objective

During the menstrual cycle, the following hormone concentrations were recorded: Day 12 - estrogen \(200\) pg/mL, progesterone \(5\) ng/mL; Day 14 - estrogen \(400\) pg/mL, progesterone \(15\) ng/mL. (i) Identify the hormone that triggers ovulation and explain how its change leads to the LH surge. (ii) If after ovulation progesterone failed to rise above \(10\) ng/mL, predict the likely effect on the corpus luteum and the subsequent menstrual cycle.

Answer Options

A. Progesterone; insufficient estrogen causes delayed LH surge, resulting in a prolonged luteal phase and delayed menstruation.
Correct Answer B. Estrogen; insufficient progesterone causes early regression of the corpus luteum, leading to a shortened luteal phase and early menstruation.
C. FSH; inadequate progesterone results in persistent follicular development, extending the follicular phase and postponing menstruation.
D. LH; low progesterone leads to failure of corpus luteum formation, causing anovulation and absence of menstruation.
Correct Answer
B
Correct Option:
Estrogen; insufficient progesterone causes early regression of the corpus luteum, leading to a shortened luteal phase and early menstruation.

About This Question

This is Neco 2018 Biology Question 28. It is one of the objective questions from the 2018 Neco Biology examination.

Difficulty level: Medium .

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