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Question #45536
The Question
During a clinical evaluation of a couple experiencing infertility despite the documented failure of a barrier contraceptive, it is observed that the male's spermatozoa undergo an abnormally rapid acrosomal reaction immediately upon contact with cervical secretions. Which of the following best explains the failure of fertilization in this scenario?
Options
- A.
The spermatozoa are unable to penetrate the zona pellucida due to the premature depletion of sperm lysins.
- B.
The premature acrosomal reaction triggers an early cortical reaction in the ovum, blocking sperm entry.
- C.
The spermatozoa fail to undergo capacitation, which strictly occurs only in the ampullary region of the fallopian tube.
- D.
The released hyaluronidase degrades the cervical mucus plug, leading to the immediate phagocytosis of sperm by vaginal macrophages.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Hyaluronidase|Corona_Radiata|Zona_Pellucida
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that 'the acrosomal reaction is necessary for fertilization' but fail to grasp its strict spatiotemporal dependency.
This question tests the understanding that premature activation leads to enzymatic depletion, creating a scenario where anatomical barrier failure (contraceptive failure) still results in functional infertility due to biochemical mistiming.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Reproductive Health - Class 12 |
| Concept | Barrier Method Dynamics |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |