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Question #45990
The Question
A researcher subjects imbibed seeds of a winter wheat variety to a prolonged period of low temperature (0°C - 5°C) to induce vernalization. However, during the cold treatment, the seeds are kept in a chemically induced state of complete metabolic arrest, completely suspending all meristematic activity. Upon planting under favorable photoperiods and temperatures, the plants fail to flower. Which of the following best explains this observation?
Options
- A.
The site of perception for vernalization is mature leaves, which are absent in imbibed seeds.
- B.
Vernalization requires active perception by dividing cells of the shoot apex or embryo, which fails during complete metabolic arrest.
- C.
The cold treatment induces the synthesis of Abscisic Acid (ABA) which permanently antagonizes the flowering stimulus.
- D.
Metabolic arrest prevents the conversion of the inactive phytochrome (Pr) to the active form (Pfr) required for vernalization.
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
Vernalization Mechanism|Diapause vs Hibernation vs Aestivation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Differentiating the site of perception and physiological requirements of Vernalization vs.
Photoperiodism.
The trap relies on the common misconception that mere physical exposure to cold is sufficient for vernalization.
Students must synthesize the NCERT fact that vernalization is perceived by the 'embryo/shoot apex' with the logical deduction that perception is an active biological process requiring functional, metabolically active meristematic tissue.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Vernalization Mechanism |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |