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Question #46296
The Question
During the development of the stomatal apparatus in a dicot leaf, a Guard Mother Cell (GMC) divides to form two specialized guard cells. A researcher treats the developing leaf tissue with a highly specific chemical inhibitor that completely blocks centriole duplication during the S-phase. Which of the following will be the most likely outcome regarding the formation of the stomatal pore?
Options
- A.
The GMC will fail to organize the spindle fibers, leading to a failure in morphogenetic geometry and an absent stomatal pore.
- B.
The division will proceed normally to form functional guard cells, as angiosperms lack centrioles and rely on acentriolar MTOCs for phragmoplast orientation.
- C.
The GMC will arrest in the G2 phase because the S-phase checkpoint detects the absence of duplicated centrosomes.
- D.
The resulting guard cells will be highly asymmetrical due to the disruption of the centrosome-mediated division plane.
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
Stomatal Apparatus Anatomy|Cell Cycle and Cell Division|Meristematic Polarity
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize the NCERT fact that 'centriole duplication occurs in S phase' but fail to integrate the taxonomic constraint that 'higher plants lack centrioles'.
The trap exploits the assumption that complex morphogenetic geometry (like stomatal pore formation) requires animal-like centrosomes for spindle orientation.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Stomatal Apparatus Anatomy |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |