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Question #46231
The Question
In many biennial plants, exposure to prolonged low temperatures (vernalization) is essential for the transition from the vegetative to the reproductive phase. If a rosette biennial plant is artificially deprived of this cold stimulus throughout its life cycle, which of the following best describes the resulting physiological and morphological state?
Options
- A.
The plant undergoes precocious reproductive development due to the spontaneous activation of floral meristem identity genes.
- B.
Internodal elongation remains suppressed, and the plant retains its rosette phyllotaxy due to the absence of a cold-induced gibberellin surge.
- C.
Leaf primordia production ceases entirely, leading to premature senescence mediated by high abscisic acid concentrations.
- D.
The shoot apical meristem transitions to a floral meristem, but leaf vernation is desynchronized, causing an abnormal canopy architecture.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Leaf Vernation|Vernalization Mechanism|Gibberellins
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that 'vernalization = flowering' but fail to integrate it with the morphological prerequisite of 'bolting' (internodal elongation) and its specific hormonal driver (Gibberellins) in rosette plants.
The misconception is treating vernalization purely as a reproductive switch, ignoring its profound effect on vegetative cell expansion dynamics and phyllotaxy.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Morphology of Flowering Plants - Class 11 |
| Concept | Leaf Vernation and Phyllotaxy |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |