Before You Begin
Question #46869
The Question
A researcher introduces a systemic diuretic agent into Pheretima that completely inhibits the tubular reabsorption of water and electrolytes. Considering the anatomical distribution and functional nature of the nephridia responsible for maximum water conservation, which of the following will be the most direct physiological consequence?
Options
- A.
Massive exudation of dilute fluid directly from the body surface from segment 3 onwards due to integumentary nephridia failure.
- B.
Severe dehydration and elimination of highly dilute, watery feces due to the functional disruption of enteronephric septal nephridia.
- C.
Accumulation of excess fluid in the coelomic cavities of segments 15 to the last, leading to hydrostatic rupture.
- D.
An immediate physiological shift from ureotelism to ammonotelism because the un-reabsorbed fluid provides a medium for ammonia diffusion.
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|Diuretic Dynamics|Urea Recycling
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Connecting anatomical discharge points (enteronephric vs. exonephric) with physiological osmoregulation.
Students often memorize nephridia locations but fail to realize that septal nephridia empty into the gut specifically to conserve water.
The trap tests the ability to predict the clinical outcome (watery feces) of a diuretic acting on an enteronephric system.
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 |