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Question #46285
The Question
A vector-borne phytoplasma infects a Tulipa species (Family Liliaceae), successfully evading the plant's active immune response (Systemic Acquired Resistance). The pathogen secretes effectors that disrupt the MADS-box genes at the inflorescence apex, inducing a severe case of phyllody. Which of the following statements regarding the morphological and taxonomic impact on this infected plant is INCORRECT?
Options
- A.
The standard floral formula component P(3+3) is phenotypically invalidated as the tepals revert to green, vegetative foliar organs.
- B.
The bisexual nature of the flower remains intact because phyllody exclusively alters the accessory whorls (perianth) without affecting the essential reproductive whorls.
- C.
The pathogen's interference prevents the normal expression of the epitepalous condition, typically represented by an arc connecting P and A in the floral formula.
- D.
The absence of a localized Hypersensitive Response (HR) allows the pathogen to systemically alter developmental morphology rather than causing rapid cell death at the infection site.
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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
Liliaceae|Active vs Passive Immunity|Floral Formula
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often compartmentalize plant morphology (accessory vs. essential whorls) and assume morphological diseases only affect the outermost visible layers (perianth).
The trap relies on the misconception that phyllody is limited to sepals/petals (accessory whorls), whereas it actually represents a complete collapse of the floral meristem identity, affecting reproductive whorls and invalidating the entire Liliaceae floral formula.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Morphology of Flowering Plants - Class 11 |
| Concept | Liliaceae Floral Formula |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |