Before You Begin
Question #45300
The Question
During plant tissue culture, mature differentiated parenchyma cells are induced to form an unorganized mass of dividing cells (callus) by manipulating the Auxin-Cytokinin ratio. Which of the following statements regarding the cellular and physiological changes during this process is INCORRECT?
Options
- A.
The cells undergo dedifferentiation, exiting the G0 phase to regain meristematic totipotency.
- B.
Cytokinesis in these dedifferentiated cells proceeds centrifugally via phragmoplast formation, guided by microtubules.
- C.
Maintaining an intermediate and balanced ratio of Auxin to Cytokinin in the medium will trigger redifferentiation of the callus into organized vascular tissues.
- D.
The newly formed cells in the callus mass possess thin, primary cellulosic cell walls and lack extensive secondary wall thickenings.
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 Totipotency|Differentiation vs Dedifferentiation|Cytokinin-Auxin Ratio
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between the hormonal requirements for dedifferentiation (callus maintenance via balanced Auxin:Cytokinin) versus redifferentiation (organogenesis via skewed ratios).
Common Misconception: Students often assume that simply being in a nutrient medium with growth regulators automatically leads to the formation of organized plantlets, failing to recognize that a balanced hormonal ratio arrests the tissue in an unorganized, continuously dividing callus state.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Cell Cycle and Cell Division - Class 11 |
| Concept | Plant Cell Cytokinesis |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |