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Question #46830
The Question
In a mutant angiosperm, the genetic pathway responsible for suberin biosynthesis in the developing integuments is completely disrupted. Consequently, the seed coat fails to develop its characteristic hydrophobic barrier. Which of the following physiological outcomes is most likely to be observed in these mutant seeds, and what is the underlying mechanism?
Options
- A.
They will undergo precocious germination due to premature imbibition, which triggers Gibberellic Acid (GA) synthesis and overrides Abscisic Acid (ABA) mediated dormancy.
- B.
They will enter a state of prolonged secondary dormancy because the highly permeable seed coat allows the rapid influx of exogenous chemical inhibitors from the soil.
- C.
They will fail to germinate entirely, as the absence of a suberized boundary prevents the retention of hydrolytic enzymes secreted by the aleurone layer.
- D.
They will require extensive mechanical scarification to initiate imbibition, as the lack of suberin induces compensatory lignification in the seed coat.
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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
Abscisic Acid|Gibberellins|Phellem|Seed Dormancy Breaking
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often compartmentalize physical dormancy (seed coat impermeability) and physiological dormancy (ABA/GA balance) as independent mechanisms.
The trap lies in failing to recognize that the physical barrier prevents the very first step of germination (imbibition).
Imbibition is the prerequisite trigger that shifts the hormonal balance from ABA-dominated (dormancy) to GA-dominated (germination).
Removing the physical barrier forces this physiological shift prematurely.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Periderm Components |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |