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Question #45965
The Question
In a transgenic rosette plant, an RNA interference (RNAi) construct is introduced to specifically silence the mRNA of the Gibberellin receptor (GID1) exclusively in the shoot apical meristem and stem tissues. If the seeds of this plant are germinated and the mature plant is subsequently sprayed with exogenous Gibberellic acid (GA3), which of the following represents the most likely physiological outcome?
Options
- A.
Seed germination is completely inhibited due to the failure of alpha-amylase synthesis, and bolting is absent.
- B.
Seed germination proceeds normally via alpha-amylase activity, but the plant fails to exhibit bolting prior to flowering.
- C.
Exogenous GA3 induces rapid bolting by directly degrading DELLA repressor proteins, bypassing the silenced receptors.
- D.
The plant exhibits normal bolting due to cell wall plasticization, but the seeds require exogenous GA3 to break 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
GA-receptors|GID1|RNAi|Cell_Wall_Enzymes
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Understanding that hormone action strictly requires specific receptors (signal transduction) and that tissue-specific RNAi can decouple two classic NCERT functions of Gibberellin (seed germination vs. bolting).
The trap relies on the misconception that applying an exogenous hormone spray will force a physiological response regardless of the receptor's presence.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Gibberellin Bolting Logic |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |