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Question #45959
The Question
When a plant is subjected to prolonged high temperatures and high concentrations, a temporary reduction in apical dominance is observed. Which of the following best explains the metabolic basis for this phenomenon?
Options
- A.
The ATP-consuming cycle creates an energy deficit, compromising the active, polar basipetal transport of auxin mediated by carrier proteins.
- B.
Increased oxygenase activity of RuBisCO directly oxidizes indole-3-acetic acid (IAA) in the chloroplast, preventing its translocation.
- C.
The release of in the mitochondria during photorespiration directly inhibits the synthesis of auxin in the shoot apical meristem.
- D.
Depletion of NADPH during the conversion of glycine to serine in peroxisomes halts the passive diffusion of auxin to lateral buds.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Auxin Polarity|Photorespiration Metabolic Cost|Carbon fixation efficiency
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating Photosynthesis with Plant Growth and Development.
Students often memorize that photorespiration decreases yield, but fail to apply its 'ATP-wasting' nature to other energy-dependent physiological processes like the active polar transport of auxin.
The trap in Option D also tests the exact sequence and location of the cycle (chloroplast -> peroxisome -> mitochondrion).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Auxin Polarity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |