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Question #46814
The Question
In a dicot stem undergoing secondary growth, the structural integrity of the outer protective layers depends on the kinetic balance between the vascular cambium and the cork cambium (phellogen). If a mutation causes the phellogen to become hyperactive, such that the rate of periderm formation significantly outpaces the radial expansion driven by secondary xylem production, what will be the most likely anatomical consequence?
Options
- A.
Premature rupturing and fissuring of the periderm due to mechanical stress, exposing inner tissues.
- B.
Excessive accumulation of secondary phloem, which eventually crushes the primary xylem.
- C.
Complete cessation of lenticel formation due to the rapid and continuous deposition of suberized phellem.
- D.
Inward proliferation of the phelloderm, which directly crushes the actively dividing vascular cambial ring.
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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
Phellogen|Bark_Formation|Vascular_Cambium
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often view secondary growth as a set of independent processes rather than a mechanically coupled system.
A common misconception is assuming that hyperactive phellogen simply results in a thicker, more protective bark.
In reality, plant anatomy relies on tissue equilibrium; rigid suberized layers require a proportionally expanding core to prevent structural failure and premature fissuring.
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 |