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Question #46816
The Question
Both higher plants and vertebrate animals have evolved distinct biomechanical strategies to overcome the structural constraints of increasing body mass. Which of the following statements INCORRECTLY contrasts the structural adaptations of dicotyledonous stems and chordates?
Options
- A.
Dicot stems achieve structural support for increased girth through the additive radial accumulation of secondary xylem by the vascular cambium.
- B.
Vertebrates accommodate greater body mass by continuously adding concentric layers of cartilage around the persistent embryonic notochord during adult growth.
- C.
The formation of a complete cambial ring in dicot stems involves both intrafascicular and interfascicular cambium, representing a continuous lateral meristematic strategy.
- D.
In higher vertebrates, the structural limitation of the notochord is overcome by its embryonic replacement with a modular, cartilaginous or bony vertebral column.
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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
Secondary_Growth|Meristem|Evolutionary_Trade_offs
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often equate 'growth' across kingdoms as merely 'getting bigger by adding layers'.
The trap relies on misapplying the botanical concept of additive secondary growth (cambial ring activity) to zoological skeletal development.
It tests the critical NCERT distinction that Vertebrata is defined by the replacement of the notochord, not its continuous radial thickening.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Cambial Ring Formation |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |