Before You Begin
Question #46803
The Question
Structural engineering principles are often conserved across biological kingdoms. The 'hollow cylinder' architecture is observed in both the stele arrangement of a typical dicotyledonous stem and the long bones of class Aves. Which of the following statements regarding these structural adaptations is INCORRECT?
Options
- A.
The peripheral ring arrangement of vascular bundles in a dicot stem and the pneumatic long bones of Aves both provide high resistance to bending stresses while minimizing overall structural mass.
- B.
Unlike the hollow-cylinder architecture of the dicot stem, the stele of a dicot root forms a solid central core to primarily resist longitudinal pulling forces exerted by the soil.
- C.
To maximize mechanical support against gravity, the central pith within the stele of a mature dicot stem is composed of dead, heavily lignified sclerenchymatous cells.
- D.
In Aves, the long bones are hollow with air cavities to reduce weight for flight, whereas the central region of the dicot stem stele is occupied by living cells that can store food materials.
Check Your Answer
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
Stele|Xylem|Phloem|Pneumatic_Adaptation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often assume that because a tree trunk or stem requires immense mechanical support to stand upright, its central core (pith) must be made of dead, mechanical tissue (sclerenchyma).
However, mechanical support in dicot stems is actually provided by the peripheral arrangement of vascular bundles and sclerenchymatous pericycle/bundle caps, leaving the central pith parenchymatous.
This tests the student's ability to separate structural engineering concepts from specific NCERT histological facts.
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 |