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Question #46288
The Question
During a plant tissue culture experiment, a researcher successfully induces an undifferentiated mass of cells (callus) from mature medullary ray parenchyma. Which of the following statements regarding the cellular processes and subsequent morphogenetic patterning is strictly INCORRECT?
Options
- A.
The initial formation of the callus from mature parenchyma represents dedifferentiation, wherein cells regain the capacity to divide.
- B.
Transferring the callus to a medium with a high cytokinin-to-auxin ratio will induce redifferentiation, leading to shoot bud formation.
- C.
A high auxin-to-cytokinin ratio in the medium will trigger the dedifferentiation of the callus, promoting the formation of a root system.
- D.
The callus cells possess totipotency but lack the spatial polarity required for organized organogenesis without specific exogenous hormonal gradients.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Meristematic Polarity|Differentiation vs Dedifferentiation|Plant Growth and Development
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between Dedifferentiation (specialized cell -> dividing cell/callus) and Redifferentiation (dividing cell/callus -> specialized organ/root).
The trap relies on 'Word-Play' and 'Functional Overlap'.
Students often memorize the Auxin/Cytokinin ratios (Auxin = Root, Cytokinin = Shoot) and will quickly scan Option C, see 'Auxin -> Root', and assume it is correct, completely missing the fatal misuse of the term 'dedifferentiation' instead of 'redifferentiation'.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Meristematic Polarity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |