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Question #46143
The Question
In Ascaris lumbricoides (an Aschelminth), sex determination is strictly genetic, and mate location relies heavily on localized pheromonal signaling rather than the complex systemic endocrine networks seen in higher chordates. If an experimental chemical completely blocks the receptor-ligand binding of these sex pheromones, which of the following represents the most accurate physiological consequence?
Options
- A.
Complete cessation of gametogenesis due to the disruption of the neuro-endocrine feedback loop.
- B.
Reproductive incompetence due to the failure of chemotactic mate location, though gamete production remains unaffected.
- C.
Degeneration of the copulatory spicules in males due to the lack of continuous neuro-hormonal stimulation.
- D.
Reversal of the genetic sex determination mechanism, leading to the development of monoecious individuals.
Check Your Answer
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
Aschelminthes Sex Differentiation|Feedback Mechanism Loops|Hormone Receptors Location
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often conflate the systemic endocrine regulation of reproduction in humans (where blocking reproductive hormones halts gametogenesis) with the localized pheromonal signaling in lower invertebrates (where blocking pheromones only halts behavioral mate location, not gamete production).
The trap relies on the 'Functional Overlap' misconception, assuming all reproductive chemical signals regulate gonadal cell division.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Aschelminthes Sex Differentiation |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |