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Question #46109
The Question
In an earthworm (Pheretima), the true coelom is divided into metameric compartments by intersegmental septa. If a developmental mutation completely prevents the formation of these septa while leaving the closed circulatory system and body wall musculature intact, which of the following would be the most direct and severe physiological consequence?
Options
- A.
Inability to maintain localized hydrostatic pressure gradients, resulting in the failure of peristaltic locomotion and disruption of interstitial fluid equilibrium.
- B.
Immediate mixing of blood with coelomic fluid, converting the closed circulatory system into an open circulatory system.
- C.
Complete cessation of cutaneous respiration due to the inability of the unpartitioned coelomic fluid to transport atmospheric oxygen to deep tissues.
- D.
Failure of the organism to synthesize hemoglobin, as the structural framework for the blood glands is entirely lost.
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
Annelida|Eucoelomate|Schizocoely
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that earthworms possess a 'hydrostatic skeleton' but fail to understand the mechanical necessity of metamerism (septa) in making it functional.
The trap lies in confusing the roles of coelomic fluid with blood (hemolymph in open systems) or assuming septa are vascular barriers rather than coelomic partitions.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Coelom Categorization |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |