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Question #46190
The Question
An avian specimen develops a functional adenoma in its parathyroid glands, resulting in chronic hypersecretion of its primary hormone. Considering the unique evolutionary adaptation of the avian endoskeleton, which of the following represents the most accurate physiological consequence?
Options
- A.
Accelerated osteoclast-mediated demineralization of pneumatic bones, leading to structural failure and systemic hypercalcemia.
- B.
Enhanced osteoblast activity to reinforce the thin cortical bone, resulting in hypocalcemia and increased bone density.
- C.
Increased renal excretion of Ca²⁺ to maintain homeostasis, preventing the abnormal ossification of pneumatic cavities.
- D.
Synergistic activation of Thyrocalcitonin (TCT) to stimulate bone resorption, compromising the flight adaptation.
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
Aves Pneumatic Bones|Hormonal Feedback Loops|Osteoclast activity
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question tests the synthesis of two distinct NCERT chapters: 'Animal Kingdom' (avian pneumatic bones) and 'Chemical Coordination and Integration' (PTH functions).
The common misconception is confusing the specific actions of PTH (osteoclastic, hypercalcemic, renal reabsorption) with Thyrocalcitonin (osteoblastic, hypocalcemic).
Students must also recognize that 'resorption' means bone breakdown, not building.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Aves Pneumatic Bones |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |