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Question #45478
The Question
Human oogenesis features two distinct meiotic arrests, contrasting with the continuous 'no-rest' process of microsporogenesis in angiosperms. If a chemical inhibitor is applied to a developing anther to artificially induce an arrest exactly homologous to the second physiological arrest of human oogenesis, which of the following accurately describes the resulting state of the microspore mother cell derivatives?
Options
- A.
Arrested at Diplotene of Prophase I, possessing a diploid (2n) chromosome number with 4C DNA content.
- B.
Arrested at Metaphase II, possessing a haploid (n) chromosome number with 2C DNA content.
- C.
Arrested at Metaphase II, possessing a haploid (n) chromosome number with 1C DNA content.
- D.
Arrested at Prophase II, possessing a haploid (n) chromosome number with 4C DNA content.
Check Your Answer
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
Meiotic_Arrest_Points|Pollen_Grain_Development|Primary_Oocyte
Why This Question Is Tricky
Common Mistakes
The Conceptual Pivot requires synthesizing three distinct NCERT concepts: the chronology of human oogenesis (Metaphase II arrest), the continuous nature of plant microsporogenesis, and the quantitative nuance of ploidy vs.
DNA content (n vs.
C) during the cell cycle.
A common misconception is equating 'haploid' directly with '1C' DNA content, forgetting that during Metaphase II, chromosomes still consist of two sister chromatids (2C).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Sexual Reproduction in Flowering Plants - Class 12 |
| Concept | Microsporogenesis Ploidy Shift |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |