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Question #45335
The Question
In an experiment on Piper nigrum (black pepper), a specific chemical is applied to the stigma that completely inhibits compatible pollen-pistil interaction. Which of the following accurately describes the subsequent developmental fate of the ovule?
Options
- A.
The failure of triple fusion prevents PEN formation, halting the hormonal cascade required for nucellar persistence, resulting in an abortive ovule without perisperm.
- B.
Syngamy fails, but the nucellus undergoes autonomous diploid proliferation to form a nutrient-rich perisperm, resulting in an empty seed.
- C.
The central cell spontaneously divides to form a pseudo-endosperm, which triggers the nucellus to degenerate completely.
- D.
The absence of pollen tube entry induces apomictic development of the nucellus into a diploid embryo, bypassing double fertilization.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Double Fertilization Stoichiometry|Pollen-Pistil Interaction|Perisperm
Why This Question Is Tricky
Common Mistakes
The Conceptual Pivot lies in understanding that 'persistent nucellus' (perisperm) is not a passive remnant.
Its persistence and transformation into a nutritive tissue is an active, hormonally-driven process strictly dependent on successful double fertilization.
Students often confuse structural origins (nucellus -> perisperm) with developmental autonomy, failing to realize that without the 2n/3n trigger, the entire ovule aborts.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Sexual Reproduction in Flowering Plants - Class 12 |
| Concept | Perisperm vs Pericarp |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |