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Question #46185
The Question
Crocodiles represent an evolutionary anomaly within Class Reptilia due to the presence of a four-chambered heart. Which of the following statements regarding their circulatory physiology is INCORRECT?
Options
- A.
The ventricles are completely partitioned, preventing the mixing of oxygenated and deoxygenated blood within the heart chambers.
- B.
Similar to mammals, its four-chambered heart ensures that oxygenated and deoxygenated blood never mix in the systemic circulation.
- C.
It retains the typical reptilian feature of possessing both left and right systemic arches.
- D.
During prolonged diving, a specialized extra-cardiac shunt mechanism allows blood to bypass the pulmonary circuit.
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
Reptilian Heart Anatomy|Foramen of Panizza|Evolutionary Chronology
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often heuristically equate a '4-chambered heart' strictly with 'complete double circulation and zero blood mixing' (the mammalian/avian model).
This question traps students who fail to recognize that crocodilians retain reptilian vascular anatomy (dual systemic arches) and utilize extra-cardiac shunting (Foramen of Panizza) for physiological adaptations like diving.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Reptilian Heart Anatomy |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |