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Question #47503
The Question
In human oogenesis, primary oocytes exhibit an obligate meiotic arrest at the dictyotene stage. If a hypothetical mutation in an angiosperm caused its Megaspore Mother Cell (MMC) to undergo an identical, permanent meiotic arrest, which of the following would be the most direct consequence on its life cycle?
Options
- A.
Failure of the diplontic to haplontic transition, resulting in the complete absence of a functional embryo sac.
- B.
The megasporocyte would bypass meiosis and directly differentiate into a diploid female gametophyte.
- C.
Arrest of the developing megaspore at Metaphase II, preventing syngamy during double fertilization.
- D.
The sporophytic generation would immediately become nutritionally dependent on the gametophytic tissue.
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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
Vascular Evolution Sequence|Lichen Symbiotic Logic|Bryophyte Dependence Mechanics
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating human reproductive physiology (Dictyotene arrest in Prophase I) with plant embryology (Sporic meiosis).
The trap relies on students confusing the stages of meiotic arrest (Prophase I vs Metaphase II) and failing to recognize that halting sporic meiosis fundamentally prevents the establishment of the gametophytic generation in plants.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Lichen Symbiotic Logic |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |