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Question #45329
The Question
In a mutant angiosperm, a genetic defect causes the accelerated degradation of cytokinins immediately following double fertilization. Based on the hormonal regulation of seed development, which of the following is the most likely consequence?
Options
- A.
A. The Primary Endosperm Nucleus (PEN) fails to undergo karyokinesis, resulting in the complete absence of endosperm.
- B.
B. The endosperm fails to undergo cellularization, remaining in a free-nuclear state and causing subsequent embryo arrest.
- C.
C. The zygote undergoes rapid premature differentiation, bypassing the globular and heart-shaped stages.
- D.
D. The seed undergoes precocious germination (vivipary) due to the loss of cytokinin-induced seed dormancy.
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
Central Cell|Double Fertilization|Growth Regulators
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Differentiating between karyokinesis and cytokinesis during endosperm development, and linking cytokinesis specifically to cytokinin activity.
The trap assumes students will think a lack of cytokinin halts all division (Option A), missing that free-nuclear endosperm is formed via karyokinesis without cytokinesis.
It tests the synthesis of Class 12 reproduction (endosperm types) with Class 11 plant physiology (PGR functions).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Sexual Reproduction in Flowering Plants - Class 12 |
| Concept | Endosperm Development Sequencing |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |