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Question #45509
The Question
In human females, the chronological progression of oogenesis is strictly synchronized with the endocrine function of the corpus luteum. If a secondary oocyte is ovulated but fertilization fails, which of the following represents the correct physiological state and sequence of events?
Options
- A.
The oocyte completes Meiosis II to form a mature ovum before degenerating, while the corpus luteum undergoes luteolysis due to the absence of hCG.
- B.
The oocyte degenerates while arrested in Metaphase II, and the corpus luteum regresses because basal LH is insufficient to maintain it without syncytiotrophoblast-derived hCG.
- C.
The oocyte degenerates in Metaphase II, which directly triggers the fallopian tube to secrete prostaglandins that cause the corpus luteum to regress.
- D.
The oocyte remains viable in the fallopian tube for 7 days, after which the sudden withdrawal of progesterone from the regressing corpus luteum induces its apoptosis.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Corpus Luteum|Oogenesis|Spermatogenesis|Meiosis II
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often mistakenly believe that a fully mature 'ovum' is ovulated and degenerates if unfertilized.
This question forces the realization that a true ovum only exists post-fertilization.
It also tests the temporal desynchronization concept: the Corpus Luteum's survival is strictly dependent on embryonic rescue (hCG), not maternal signals, highlighting the critical intersection of gamete fate and endocrine support.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Corpus Luteum Fate |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |