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Question #45944
The Question
The Flavr Savr tomato is a classic example of genetic optimization used to extend post-harvest shelf life by altering the fruit's metabolic senescence. Which of the following statements regarding the physiological and molecular basis of this transgenic plant is INCORRECT?
Options
- A.
It employs antisense RNA technology to prevent the translation of the enzyme polygalacturonase.
- B.
The transgenic modification delays the degradation of calcium and magnesium pectate in the middle lamella.
- C.
By inhibiting the ripening enzyme, the genetic alteration artificially extends the exponential (log) phase of the fruit's growth curve.
- D.
The formation of a double-stranded RNA (dsRNA) complex in the cytoplasm is a critical step in silencing the target gene.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Polygalacturonase inhibition|Cell Wall Softening|Growth Duration
Why This Question Is Tricky
Common Mistakes
The 'Conceptual Pivot' relies on synthesizing knowledge across three NCERT chapters: Biotechnology (RNA silencing), Cell Biology (Middle lamella composition), and Plant Growth (Phases of the growth curve).
The common misconception is conflating 'delayed aging/senescence' with 'prolonged active growth'.
Students often assume that extending shelf-life means extending the active growth (log) phase, failing to realize the fruit has already reached its maximum size (stationary phase) before ripening metabolism begins.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Growth Rate Quantification |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |