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Question #45515
The Question
Both angiosperms and humans have evolved precise, sequential mechanisms to ensure nourishment for the developing embryo—namely, the endosperm and the progesterone-maintained endometrium, respectively. Which of the following statements regarding the regulatory triggers and developmental sequencing of these systems is INCORRECT?
Options
- A.
In angiosperms, endosperm development precedes embryo development to provide assured nutrition, just as the corpus luteum develops to prepare the endometrium before blastocyst implantation.
- B.
If fertilization fails in humans, the corpus luteum degenerates into the corpus albicans, causing a drop in progesterone, mirroring the failure of seed development if double fertilization does not occur.
- C.
The rupture of the Graafian follicle is triggered by a positive feedback loop where peak levels of progesterone induce an LH surge, whereas endosperm development is initiated by triple fusion.
- D.
The Primary Endosperm Nucleus (PEN) is triploid and its formation is a prerequisite for endosperm development, while the Graafian follicle contains a secondary oocyte arrested in metaphase II.
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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
Progesterone/Estrogen Feedback|Ovarian Follicle Stages|Endosperm Development Sequencing
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Hormonal Feedback Timing & Functional Overlap.
Students frequently confuse the roles of Estrogen and Progesterone in the menstrual cycle.
Because Progesterone is the 'pregnancy hormone' that maintains the uterine lining, students often fall for the trap that it also triggers the critical ovulatory event.
By embedding this human physiology misconception within a cross-kingdom analogy (comparing it to the endosperm trigger in plants), the question forces the student to synthesize concepts from two different NCERT chapters simultaneously.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Ovarian Follicle Stages |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |