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Question #46127
The Question
In Porifera, despite the absence of true tissues, cellular coordination is structurally mediated by the mesohyl. Suppose a targeted chemical selectively inhibits the secretory mechanism of scleroblasts and spongioblasts, analogous to a glandular secretion failure in higher animals. Which of the following would be the most direct and immediate physiological consequence of this extracellular matrix disruption?
Options
- A.
The choanocytes will immediately lose their ability to phagocytose food particles due to the absence of extracellular digestive enzymes.
- B.
The structural collapse of the aquiferous canal system, leading to a systemic failure in nutrition, respiration, and excretion.
- C.
The pinacoderm will undergo compensatory differentiation into a true epithelial tissue with a basement membrane.
- D.
The direction of water flow will reverse, entering the osculum and exiting the ostia due to altered hydrostatic pressure.
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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
Pinacocytes|Glandular Secretion Mechanism|Mesohyl
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize 'cellular level of organization' and mistakenly assume sponge cells act completely independently without structural interdependence.
The trap is failing to recognize that the mesohyl acts as a functional extracellular matrix.
Just as disrupting glandular secretion of ECM in higher animals causes tissue collapse, disrupting spicule/spongin secretion in sponges causes the systemic collapse of the canal system, bridging the gap between cellular independence and whole-organism physiological coordination.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Porifera Canal System dynamics |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |