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Question #47385
The Question
When comparing the structural support systems of a human (endoskeleton) and a cockroach (exoskeleton), a student notes several anatomical features. Which of the following statements is INCORRECT regarding their comparative anatomy?
Options
- A.
Both systems provide surface area for muscle attachment and represent analogous structures driven by convergent evolution.
- B.
The human axial skeleton is derived from the embryonic mesoderm, whereas the chitinous exoskeleton of the cockroach is secreted by an ectodermally derived epidermis.
- C.
Just as the human axial skeleton features a single ventral bone called the sternum, the cockroach exoskeleton features a single, continuous ventral sclerite called the sternum spanning its thorax and abdomen.
- D.
The human vertebral column exhibits internal metamerism with 26 serially arranged units, while the cockroach exhibits external metamerism where the head is formed by the fusion of six embryonic segments.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Analogous Organ Structure|Axial Skeleton Count|Vertebral Column
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The term 'sternum' is used in both human anatomy (a single axial bone) and insect anatomy (ventral sclerites, properly called sternites).
The trap exploits the cognitive dissonance between endoskeletal and exoskeletal structural plans.
Students often apply vertebrate endoskeletal logic to arthropods, assuming the insect 'sternum' is a single continuous ventral plate rather than a series of segmentally arranged sclerites, thereby failing to recognize the true nature of arthropod metamerism.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Locomotion and Movement - Class 11 |
| Concept | Axial Skeleton Count |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |