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Question #46104
The Question
Cephalization in bilaterally symmetrical vertebrates facilitated complex, directional locomotion by centralizing neural control. If a vertebrate exhibits severe ataxia—characterized by uncoordinated voluntary movements and loss of balance—despite having a fully functional motor cortex and intact neuromuscular junctions, which specific neural structure and its associated NCERT-defined feature are most likely compromised?
Options
- A.
The hindbrain structure possessing a very convoluted surface to provide additional space for many more neurons.
- B.
The major coordinating centre for sensory and motor signaling around which the cerebrum wraps.
- C.
The association areas of the cerebral cortex responsible for complex functions like intersensory associations.
- D.
The hindbrain structure consisting primarily of fibre tracts that interconnect different regions of the brain.
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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
Cerebellar_Coordination_Dynamics|Symmetry_and_Cephalization_correlation|Neural_Control
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between the generation of motor impulses (Cerebrum/Motor Cortex) and the fine-tuning/coordination of those impulses (Cerebellum).
Students often fail to recognize the exact NCERT anatomical description of the cerebellum ('convoluted surface for additional neurons') when presented in an applied clinical scenario (ataxia) alongside other exact NCERT descriptions of brain parts.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Symmetry and Cephalization correlation |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |