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Question #47572
The Question
Cnidarians exhibit a tissue level of organization and are strictly diploblastic. Despite lacking a true mesoderm, they successfully maintain epithelial polarity and structural integrity. Which of the following statements regarding their structural organization and germ layer integration is INCORRECT?
Options
- A.
Cells performing similar functions are aggregated into distinct tissues, representing an evolutionary advancement over the cellular level of organization seen in Porifera.
- B.
An undifferentiated layer called mesoglea is present between the ectoderm and the endoderm, acting as a supportive extracellular matrix.
- C.
Their structural integrity relies on a primitive connective tissue network derived from the mesoderm, which permeates the mesoglea to anchor the epithelial layers.
- D.
Spatial orientation and epithelial polarity are maintained by intercellular junctions and the hydrostatic support of the mesoglea, compensating for the absence of a mesodermal scaffold.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Economic Importance Matrix|Stratification Efficiency|Sphagnum
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The trap exploits the functional similarity between the mesoglea and connective tissue.
Because the mesoglea acts as a structural scaffold (a function typically performed by mesoderm-derived connective tissues in higher animals), students often fall for the 'Common Half-Truth' that it must contain a primitive mesodermal network.
This tests the strict embryological definition of 'diploblastic' against functional morphology.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Kingdom - Class 11 |
| Concept | Economic Importance Matrix |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |