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Question #46811
The Question
In a laboratory experiment, a developing dicot root is treated with a chemical inhibitor that completely disrupts the polar transport of Auxin (IAA). As a direct systemic fallout, the parenchymatous cells located between the primary xylem and primary phloem fail to undergo dedifferentiation. Which of the following will be the ultimate anatomical consequence in this root?
Options
- A.
The root will fail to form a continuous wavy vascular cambial ring, permanently halting secondary growth.
- B.
The intrafascicular cambium will fail to join with the interfascicular cambium, preventing the formation of a complete ring.
- C.
The pericycle will prematurely differentiate into the phellogen to initiate extrastelar secondary growth.
- D.
The primary xylem will transition into a polyarch condition with a large, conspicuous pith to compensate for the lack of secondary tissue.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Conjunctival Tissue|Auxin Polarity|Prophase I Sub-stages Sequence
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing the completely secondary origin of the vascular cambium in dicot roots (from conjunctive tissue) versus the partially primary origin in dicot stems.
The trap relies on students confusing stem anatomy (Option B) or assuming primary structures (Option D) can dynamically alter their fundamental layout (mimicking a monocot) due to a lack of secondary growth.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Conjunctival Tissue |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |