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Question #46149
The Question
In an experimental model of Pheretima (earthworm), a chemical inhibitor selectively blocks the ATP-dependent carrier proteins in the tubular region of the septal nephridia, while leaving the ciliated nephrostome and the closed vascular hemodynamics completely unaffected. Which of the following represents the primary physiological consequence of this disruption?
Options
- A.
Immediate cessation of coelomic fluid collection, leading to severe coelomic edema and hydrostatic imbalance.
- B.
Accumulation of nitrogenous wastes in the blood plasma, as active tubular secretion from the perinephridial capillary network is halted.
- C.
Excretion of highly concentrated, hypertonic urine due to the failure of active water reabsorption in the distal tubules.
- D.
Passive diffusion of dissolved haemoglobin from the blood plasma into the nephridial lumen due to altered osmotic gradients.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Nephridia|Closed_Vascular_Bed|Tubular_Secretion
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often mistakenly believe that earthworm nephridia exclusively filter coelomic fluid.
This question tests the 'NCERT-Plus' synthesis that Annelids possess a closed circulatory system with a perinephridial capillary network, making active tubular secretion essential for clearing metabolic wastes directly from the blood plasma, analogous to human renal physiology.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Annelida Circulatory System |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |