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Question #46136
The Question
Parasitic Platyhelminthes utilize hooks and suckers for attachment, while their body surface absorbs nutrients and resists host digestive enzymes. This protective tegument shares a convergent evolutionary strategy with a specific layer of the human embryonic trophoblast during implantation. Both structures evade host/maternal immune infiltration by forming a continuous layer without distinct cell boundaries. Which of the following represents this human embryonic structure and the shared anatomical feature?
Options
- A.
Cytotrophoblast; A highly regenerative stratified squamous epithelium
- B.
Syncytiotrophoblast; A multinucleated syncytium lacking intercellular spaces
- C.
Corona radiata; A dense layer of hyaluronic acid-rich protective cells
- D.
Chorionic mesoderm; A vascularized, semi-permeable connective tissue
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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
Taenia solium|Syncytiotrophoblast|Host_Parasite_Arms_Race
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The functional significance of a 'syncytium' (multinucleated state).
Students often memorize 'syncytium' in the context of skeletal muscle or the tapetum, but fail to apply its barrier function (the absence of intercellular spaces) in parasitology and embryology.
A common misconception is confusing the living, absorptive syncytial tegument of Platyhelminthes with the non-living cuticle of Nematodes (like Ascaris), thereby missing the profound evolutionary parallelism with human placentation.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Platyhelminthes Parasitic Adaptations |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |