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Question #45960
The Question
During the embryonic development of a dicot plant, a researcher applies a specific inhibitor that prevents the assembly of the phragmoplast. Consequently, the organization of the Root Apical Meristem (RAM) and the Quiescent Centre (QC) completely fails. Which of the following best explains the physiological basis of this developmental arrest?
Options
- A.
Failure of cell plate formation disrupts the polarized targeting of PIN proteins, preventing the establishment of the local auxin maxima required for QC specification.
- B.
The inability to form a cleavage furrow leads to a multinucleate condition, which directly inhibits the synthesis of auxin in the root apex.
- C.
Disruption of the phragmoplast prevents the formation of the Casparian strip, allowing auxin to leak out of the vascular cylinder into the cortex.
- D.
Golgi-derived vesicles fail to secrete cellulase, preventing cell wall expansion and physically restricting the 'Auxin Fountain' mechanism.
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
Auxin Polarity|Plant Cell Cytokinesis|Phragmoplast formation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often view cytokinesis merely as the physical division of a cell into two.
The 'NCERT-Plus' depth requires understanding that the cell plate establishes the distinct plasma membrane domains necessary for cell polarity.
Without this structural polarity, the directional transport of morphogens (like auxin via PIN proteins) fails, demonstrating how a fundamental cytological process directly dictates macroscopic organogenesis.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Auxin Polarity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |