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Question #46870
The Question
Read the following statements comparing the integumentary and excretory adaptations of the earthworm (Pheretima) and the frog (Rana). Which of the following statements is INCORRECT?
Options
- A.
Integumentary nephridia in Pheretima are attached to the lining of the body wall from the 3rd segment to the last and are exonephric in nature.
- B.
Cutaneous respiration in Rana is facilitated by a highly vascularized dermis and is the exclusive mode of gaseous exchange during hibernation and aestivation.
- C.
Unlike the closed circulatory system of amphibians, earthworms utilize an open circulatory system where hemolymph directly bathes the integumentary nephridia for waste extraction.
- D.
While amphibian skin is devoid of scales and rich in mucous glands to facilitate diffusion, the earthworm's body wall houses metamerically arranged nephridia for osmoregulation.
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
Earthworm Nephridial Placement|Amphibian Integument|Urea Recycling
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Phylogenetic Misconception.
Students frequently assume that 'lower' invertebrates like earthworms possess an open circulatory system, confusing them with Arthropods.
The trap exploits this evolutionary misconception while simultaneously testing the precise locations and functional nature (exonephric vs enteronephric) of earthworm nephridia against amphibian cutaneous adaptations.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Earthworm Nephridial Placement |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |