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Question #46256
The Question
A targeted mutation in the floral meristem identity genes of Cassia alters its natural aestivation pattern to structurally resemble that of Calotropis. Which of the following is the most likely physiological consequence of this structural shift during the floral bud stage?
Options
- A.
Increased vulnerability to premature desiccation of the essential whorls due to the loss of overlapping petal margins.
- B.
Enhanced microclimate regulation within the bud, promoting early maturation of the androecium.
- C.
Complete conversion of the corolla into a calyx-like structure due to the suppression of Class A genes.
- D.
Shift from entomophily to obligate cleistogamy due to the permanent interlocking of the valvate petals.
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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
Imbricate_Aestivation|Floral_Meristem_Identity_Genes
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize aestivation examples (Cassia = Imbricate, Calotropis = Valvate) without understanding their functional significance.
The trap lies in linking a purely morphological classification to its physiological survival value (protection from transpiration/desiccation in the bud stage).
Option C acts as a high-level distractor for students who over-apply the ABC model of flower development without reading the specific phenotypic outcome described.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Morphology of Flowering Plants - Class 11 |
| Concept | Aestivation Patterns |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |