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Question #46815
The Question
A researcher applies a highly specific chemical inhibitor to the stem of a healthy dicot plant. This inhibitor selectively blocks the G1 to S phase transition in the cells of the vascular cambium. Which of the following statements is NOT a correct consequence of this treatment?
Options
- A.
The cambial initials will exit the G1 phase, enter the quiescent stage (G0), and become metabolically inactive.
- B.
The DNA content of the cambial initials will remain at 2C, failing to double to 4C.
- C.
The differentiation of fusiform initials into new secondary tracheary elements will be completely arrested.
- D.
The existing secondary vascular tissues will continue to conduct water, minerals, and photosynthates.
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
Meristematic_Cells|G1_S_Checkpoints|Cell_Division
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse 'proliferative arrest' (quiescence) with 'metabolic inactivity'.
NCERT explicitly states that G0 cells are metabolically active.
This question also tests cross-chapter synthesis by forcing the student to apply cell cycle checkpoints (G1/S transition and 2C/4C DNA content) to the anatomical functioning of the vascular cambium (lateral meristem).
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 |