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Question #45978
The Question
Seed germination is tightly regulated by the physiological antagonism between Abscisic Acid (ABA) and Gibberellic Acid (GA). If a genetic mutation in a cereal grain completely disrupts the GA biosynthesis pathway, which of the following physiological states will be established?
Options
- A.
Unchecked ABA activity leading to the constitutive stabilization of inhibitory proteins that block metabolic reactivation.
- B.
Spontaneous degradation of the aleurone layer due to the absence of GA-induced hydrolytic enzymes.
- C.
Immediate loss of seed viability due to the inability to synthesize alpha-amylase and proteases.
- D.
Overproduction of ethylene to compensate for the lack of GA, leading to premature radicle emergence.
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
ABA|Seed Germination|GA
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often view GA and ABA functions in isolation rather than as a dynamic antagonistic balance.
The trap lies in confusing 'prolonged dormancy' with 'loss of viability' (Option C).
Understanding that the absence of GA doesn't just 'stop' germination, but actively allows ABA-mediated inhibitory proteins to remain stable, bridges NCERT facts with advanced molecular physiology.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Abscisic Acid (ABA) Antagonism |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |