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Question #46883
The Question
In an experimental setup, the spiracles of a Periplaneta americana are partially sealed with wax. This induces hypercapnia (accumulation of CO2) and a subsequent drop in hemolymph pH. Based on the physiological coupling of insect organ systems, which of the following will be the most direct consequence of this acidosis on excretory homeostasis?
Options
- A.
Inhibition of active K+ transport into the Malpighian tubules, disrupting the osmotic gradient required for urate precipitation.
- B.
Immediate physiological shift from uricotelism to ammonotelism to bypass the ATP-dependent uric acid synthesis pathway.
- C.
Increased passive diffusion of water from the hemolymph into the tubule lumen to dilute the acidic environment.
- D.
Hyperactivation of the hindgut's reabsorption mechanisms to actively secrete excess H+ ions into the rectum.
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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
Cockroach Respiratory Tracheal System|Cockroach Excretory Malpighian Tubules
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students memorize that Malpighian tubules excrete uric acid for water conservation, but often miss the underlying mechanism: active K+ transport driving osmotic flow.
The question tests the integration of respiratory and excretory systems, highlighting that a failure in gas exchange (acidosis) collapses the electrochemical gradient required for uricotelism.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Cockroach Respiratory Tracheal System |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |