Before You Begin
Question #46184
The Question
In a mutant amphibian, a genetic defect in the synthesis of a specific extracellular matrix (ECM) protein leads to a rigid, non-pliable dermis (severely impairing cutaneous respiration) and an inability of the alimentary canal to adequately distend upon the entry of food. Based on the structural organization of tissues, which of the following statements accurately explains this pleiotropic physiological failure?
Options
- A.
The mutation affects collagen fibers in the dense regular connective tissue of the dermis and the muscularis layer of the gut.
- B.
The mutation compromises elastin fibers within the dense irregular connective tissue of the dermis and the loose connective tissue of the sub-mucosa.
- C.
The defect lies in the reticular fibers of the areolar tissue, preventing the diffusion of gases and nutrients across the serosa.
- D.
The mutation inhibits the secretion of modified polysaccharides by fibroblasts, reducing the tensile strength of the mucosal epithelium.
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
Amphibian Integument | Connective Tissue Fiber Composition | Frog Digestive Enzyme Specificity
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question requires the integration of isolated NCERT facts from 'Structural Organisation in Animals' and 'Digestion and Absorption'.
Students must correctly map the mechanical property of distensibility to elastin (rather than collagen), identify the skin's dermis as dense irregular connective tissue (a common trap is confusing it with dense regular tissue like tendons), and recognize the sub-mucosa as the primary loose connective tissue layer of the gut wall.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Amphibian Integument |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |