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Question #46211
The Question
In an experimental setup, a growing dicot root tip is continuously exposed to a medium with a significantly elevated Cytokinin-to-Auxin ratio. Based on the spatial organization of root zones and hormonal interactions, which of the following physiological anomalies will most likely be observed?
Options
- A.
The zone of elongation will undergo premature differentiation, inhibiting the proper development of the zone of maturation and severely impairing water uptake.
- B.
The meristematic zone will exhibit accelerated mitotic divisions, leading to a rapidly elongating root axis with an overabundance of root hairs.
- C.
Cells in the zone of maturation will dedifferentiate back into meristematic cells, leading to the rapid formation of secondary lateral roots.
- D.
The root cap will prematurely degenerate due to the suppression of dictyosome activity, exposing the apical meristem to mechanical damage.
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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
Root Cap|Zone of Elongation|Root Apical Meristem
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize 'Cytokinin promotes cell division' and may incorrectly assume it enhances root meristematic activity (Option B).
The trap lies in failing to integrate the Skoog-Miller ratio with the spatial zones of the root.
Students must deduce that forcing differentiation via high Cytokinin stunts the elongation zone, thereby preventing the normal formation of the maturation zone and its critical root hairs.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Morphology of Flowering Plants - Class 11 |
| Concept | Root Region Differentiation |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |