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Question #46878
The Question
A researcher experimentally blocks the stomatogastric nervous impulses to the proventriculus (gizzard) of Periplaneta americana. Which of the following is the most likely immediate structural and physiological consequence in its alimentary canal?
Options
- A.
Unregulated entry of coarse food particles into the mesenteron, causing mechanical damage to its delicate peritrophic membrane.
- B.
Failure of the six highly chitinous plates to grind food, leading to the accumulation of coarse particles inside the hepatic caecae.
- C.
Permanent constriction of the stomodaeal sphincter, causing massive distension and eventual rupture of the crop.
- D.
Immediate shedding of the cuticular lining in the foregut, exposing the underlying epithelial cells to abrasive food particles.
Check Your Answer
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
Stomodaeal_Valve|Feedback_Mechanism_Loops|Crop
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that the gizzard 'grinds food' but overlook its critical role as a regulated sphincter (stomodaeal valve) that protects the delicate, non-cuticularized midgut.
The trap relies on understanding the structural differences between the foregut (cuticularized) and midgut (peritrophic membrane), and applying the physiological principle that denervation of a sphincter typically results in flaccid paralysis and unregulated flow.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Cockroach Alimentary Canal |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |