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Question #47561
The Question
In an experiment on a Solanum species, a chemical inhibitor is applied to the pistil immediately after pollen tube entry. Cytological analysis reveals that while the diploid zygote forms normally, the Primary Endosperm Nucleus (PEN) fails to undergo subsequent mitotic divisions. Which of the following is the most likely developmental outcome and its corresponding evolutionary classification?
Options
- A.
A. The ovule develops into a viable non-endospermous (exalbuminous) seed, representing a pre-zygotic isolation mechanism.
- B.
B. The embryo aborts due to the lack of a functional nutritive tissue, acting as a post-zygotic developmental barrier.
- C.
C. The ovary develops into a parthenocarpic fruit because triple fusion failed, mimicking apomictic seed development.
- D.
D. The zygote enters a prolonged dormant state until the diploid nucellus differentiates into a substitute endosperm.
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
Classification System Nuances|Mycorrhiza Nutrient Dynamics|Pinus
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse 'non-endospermous' (exalbuminous) mature seeds with a complete absence of endosperm formation.
NCERT specifies that endosperm forms in all viable angiosperm seeds but may be fully consumed by maturity.
The trap tests the sequence of embryogenesis (endosperm precedes embryo) and the definition of post-zygotic barriers (occurring after syngamy).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Kingdom - Class 11 |
| Concept | Classification System Nuances |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |