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Question #47599
The Question
During conditions of high light intensity and restricted availability, a plant exhibits an increased rate of cyclic photophosphorylation in the stroma lamellae. Which of the following best describes the systemic bioenergetic impact of this shift?
Options
- A.
It prevents the over-reduction of the stroma by bypassing NADP reductase, stabilizing the ratio and modulating the export of reducing equivalents via chloroplast shuttle systems.
- B.
It maintains continuous photolysis of water to supply electrons directly to the mitochondrial electron transport chain via the malate-aspartate shuttle.
- C.
It utilizes NADP reductase in the stroma lamellae to rapidly oxidize accumulated NADPH, restoring the redox balance required for the Calvin cycle.
- D.
It accumulates protons in the stroma rather than the thylakoid lumen, creating a gradient that drives the export of ATP to the cytosol.
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
Cyclic Photophosphorylation Pathways|Shuttle System Impact
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that cyclic photophosphorylation 'produces extra ATP' but miss its critical role in 'preventing excess NADPH production' (redox homeostasis).
The trap relies on using complex-sounding systemic interactions (shuttles) to mask fundamental NCERT violations in the distractors, such as placing NADP reductase in the stroma lamellae or claiming protons accumulate in the stroma.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Photosynthesis in Higher Plants - Class 11 |
| Concept | Cyclic Photophosphorylation Pathways |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |