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Question #46203
The Question
Analyze the following statements regarding the evolutionary progression of structural and physiological adaptations in Chordates. Which of the following statements is INCORRECT?
Options
- A.
In Branchiostoma, the notochord extends from head to tail and persists throughout life, providing a rigid longitudinal axis for metameric muscle contraction.
- B.
The incomplete ventricular septation in non-crocodilian reptiles creates a hemodynamic bottleneck by pumping mixed blood into the systemic circulation, reflecting their poikilothermic physiology.
- C.
In all members of the subphylum Vertebrata, the embryonic notochord is completely replaced by a bony vertebral column in the adult stage to support advanced locomotion.
- D.
Unlike cephalochordates, urochordates exhibit retrogressive metamorphosis where the notochord is restricted to the larval tail and is absent in the adult.
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
Notochord|Myotomes|Incomplete_Septation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Overgeneralization of Vertebrate anatomy.
Students frequently equate 'Vertebrata' exclusively with 'bony skeletons', forgetting that primitive vertebrates like Cyclostomes (Agnatha) and cartilaginous fishes (Chondrichthyes) have cartilaginous vertebral columns.
The trap relies on the absolute phrase 'all members... bony vertebral column', testing precise recall of the NCERT line 'cartilaginous OR bony'.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Evolutionary Notochord Progression |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |