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Question #46804
The Question
Plant species 'X' dominates the lowest stratum of a highly stratified forest ecosystem. A transverse section of its root reveals a stele characterized by more than six xylem bundles and a large, conspicuous pith. Which of the following statements correctly correlates this anatomical blueprint with its ecological stratification efficiency?
Options
- A.
The polyarch condition facilitates extensive secondary xylem formation, allowing the plant to eventually outcompete others for canopy space.
- B.
The polyarch stele supports a widespread fibrous root system by providing a greater radial distribution of xylem, maximizing water absorption in the competitive topsoil.
- C.
The large pith stores massive amounts of starch, which directly fuels the active transport of water through the suberized Casparian strips of the pericycle.
- D.
The presence of a polyarch stele indicates a dicotyledonous taproot system that penetrates deep soil layers to avoid niche overlap with surface-dwelling plants.
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
Stele|Polyarch_Condition|Root_Architecture
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The student must first diagnose the plant as a monocot based on stelar anatomy (polyarch xylem, large pith), then link this to its corresponding root morphology (fibrous root) and ecological niche.
The distractors test common half-truths, such as misattributing secondary growth to monocots, mislocating Casparian strips to the pericycle, or confusing the root system types between dicots and monocots.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Stele Definition |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |