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Question #46178
The Question
Consider the structural organization and ecological adaptations within the superclass Pisces. Which of the following statements is INCORRECT?
Options
- A.
In class Chondrichthyes, the notochord remains persistent throughout life and is not entirely replaced by the cartilaginous vertebral column.
- B.
Due to the absence of a swim bladder, cartilaginous fishes cannot passively regulate buoyancy and must swim constantly to avoid sinking.
- C.
A universal defining feature of all adult vertebrates is the complete replacement of the embryonic notochord by a bony or cartilaginous vertebral column.
- D.
Osteichthyes exhibit a bony endoskeleton and possess an air bladder that provides hydrostatic equilibrium across different aquatic depths.
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
Chordata_Fundamental_Trio|Evolutionary_Notochord_Progression|Chondrichthyes
Why This Question Is Tricky
Common Mistakes
The 'Generalization vs.
Exception' Trap.
Students often memorize the general defining characteristic of Vertebrata (replacement of notochord by vertebral column) but fail to integrate the specific exception found in Class Chondrichthyes, where the notochord persists throughout life alongside the cartilaginous vertebrae.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Chondrichthyes vs. Osteichthyes Buoyancy |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |