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Question #46003
The Question
During the secondary growth of a dicotyledonous stem, a targeted chemical inhibitor specifically blocks the process of dedifferentiation in the cortical parenchyma cells. Which of the following represents the most accurate anatomical and physiological consequence of this inhibition?
Options
- A.
The interfascicular cambium will fail to form, completely halting the development of the secondary vascular tissue.
- B.
The phellogen will not develop, preventing the formation of a suberized phellem and compromising the stem's defense against pathogens.
- C.
The primary epidermis will undergo rapid redifferentiation to synthesize suberin and compensate for the lack of bark.
- D.
The phelloderm will form directly from the pericycle, but the stem will lack lenticels for gaseous exchange.
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
Differentiation vs Dedifferentiation|Senescence vs Abscission|Pollen Wall Chemistry
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse the specific cellular origins of secondary meristems.
The trap lies in Option A, which correctly identifies a product of dedifferentiation (interfascicular cambium) but incorrectly links it to cortical parenchyma instead of medullary rays.
The question tests the precise NCERT mapping of 'Cortical Parenchyma -> Phellogen' vs 'Medullary Rays -> Interfascicular Cambium'.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Senescence vs Abscission |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |