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Question #46252
The Question
Both Pisum sativum (Fabaceae) and orchids (Orchidaceae) exhibit zygomorphic flowers that facilitate highly specific plant-pollinator interactions. Based on evolutionary principles, the development of bilateral floral symmetry in these two specific families represents:
Options
- A.
Homologous structures indicating descent from a recent common ancestor possessing bilateral symmetry.
- B.
Convergent evolution resulting in analogous traits driven by similar selective pressures from pollinators.
- C.
Divergent evolution where a common ancestral radial floral plan adapted to different geographical habitats.
- D.
Adaptive radiation of a single ancestral angiosperm species into distinct ecological niches.
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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
Flower Symmetry|Analogous Organ Structure|Pollinator Selection
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize standard NCERT examples of convergent evolution (e.g., sweet potato and potato) but fail to synthesize principles across chapters (Morphology and Evolution).
The trap lies in assuming that identical structural patterns (zygomorphy) automatically imply homology.
Recognizing that Fabaceae (dicot) and Orchidaceae (monocot) are distantly related is crucial to identifying their shared floral symmetry as homoplasy (an analogous trait) driven by the selective pressure of specific pollinators.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Morphology of Flowering Plants - Class 11 |
| Concept | Flower Symmetry and Sexuality |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |