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Question #46400
The Question
Which of the following statements regarding the evolutionary and physiological distinction between protonephridia and metanephridia is INCORRECT?
Options
- A.
Protonephridia in Amphioxus and Planaria are blind-ended tubules primarily concerned with ionic and fluid volume regulation, lacking a direct interface with coelomic fluid.
- B.
Metanephridia in earthworms possess a ciliated funnel that collects coelomic fluid, marking an evolutionary shift towards extracellular filtration.
- C.
The transition to metanephridia involves the structural integration of the excretory tubule with a closed blood vascular system to facilitate selective reabsorption.
- D.
Both protonephridia and metanephridia rely on high hydrostatic pressure generated by a circulatory system to drive ultrafiltration directly into the tubular lumen.
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
Flame cells|Nephridia|Earthworm|Platyhelminthes
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often project the mechanism of the human kidney (hydrostatic pressure-driven ultrafiltration from blood) onto all lower invertebrate excretory structures.
The trap lies in failing to recognize that protonephridia operate via negative pressure (flagellar beating) from interstitial fluid, as these organisms lack both a coelom and a vascular system to generate hydrostatic filtration pressure.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Excretory Products and Their Elimination - Class 11 |
| Concept | Protonephridia vs Metanephridia |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |