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Question #46126
The Question
Analyze the following statements regarding the evolutionary morphology and respiratory dynamics of Porifera and Arthropoda (specifically insects). Which of the following statements is INCORRECT?
Options
- A.
In Porifera, the water canal system serves as a shared pathway for respiratory exchange, excretion, and food gathering, relying entirely on simple diffusion across the cellular grade of organization.
- B.
Insects can sustain high metabolic rates during flight because their open circulatory system rapidly pumps oxygen-rich hemolymph directly to the metabolically active muscle tissues.
- C.
The extensive branching of the insect tracheal network compensates for the absence of respiratory pigments by delivering atmospheric oxygen directly to the cellular level via tracheoles.
- D.
While the Poriferan canal system restricts these organisms to a largely sessile lifestyle, the insect tracheal system supports high-energy demands but imposes a strict evolutionary limit on their maximum body size.
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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
Osculum|Tracheal System|Invertebrate Gas Exchange
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The decoupling of the circulatory and respiratory systems in insects.
The common misconception is that high metabolic activity (like flight) requires rapid blood/hemolymph circulation of oxygen.
Students often fail to realize that the insect tracheal system is a structural innovation that completely bypasses the hemolymph, acting as a direct-to-cell air delivery network.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Porifera Canal System dynamics |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |