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Question #45958
The Question
A typical C3 dicotyledonous stem is subjected to prolonged heat stress and high oxygen concentration. Subsequent anatomical cross-sections reveal a significant failure in the formation of a continuous cambial ring. Which of the following metabolic-anatomical linkages best explains this phenomenon?
Options
- A.
Enhanced oxygenase activity of RuBisCO creates a negative energy balance, inhibiting the ATP-dependent dedifferentiation of medullary ray cells into interfascicular cambium.
- B.
Photorespiratory loss of fixed carbon directly inhibits the redifferentiation of the intrafascicular cambium into secondary xylem and secondary phloem.
- C.
Accumulation of phosphoglycolate in the chloroplasts directly inhibits the differentiation of the procambium into primary vascular tissues.
- D.
The high metabolic cost of the C2 cycle depletes ATP, preventing the dedifferentiation of the pericycle into the vascular cambium.
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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
Rubisco Dual Functionality|Photorespiration Metabolic Cost|Secondary Growth
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question tests the synthesis of Plant Physiology (Photorespiration) and Plant Anatomy (Secondary Growth).
Students often memorize these chapters in silos.
The trap relies on recognizing that dedifferentiation is an active, ATP-dependent process vulnerable to metabolic sinks like photorespiration.
Furthermore, Option D employs a high-frequency NEET location trap by confusing the origin of the vascular cambium in stems (medullary rays) with that in roots (pericycle).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Differentiation vs Dedifferentiation |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |