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Question #47606
The Question
When the environmental thermal tolerance limit of a plant is breached, the kinetic activity of RuBisCO shifts, triggering a physiological breakdown that ultimately reduces the ecosystem's Net Primary Productivity (NPP). Which of the following statements regarding this cascade is INCORRECT?
Options
- A.
The competitive binding at RuBisCO's active site shifts in favor of , cleaving RuBP into one molecule of phosphoglycerate and one molecule of phosphoglycolate.
- B.
The photorespiratory pathway involves the sequential interaction of the chloroplast, peroxisome, and mitochondrion, acting as a net drain on the plant's carbon reserves.
- C.
During this pathway, the decarboxylation event occurs in the mitochondrion, which simultaneously synthesizes a small amount of ATP to partially offset the energy deficit.
- D.
The resulting decline in NPP directly diminishes the biomass available to the grazing food chain and subsequently reduces the energy flow into the detritus food chain.
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
Thermal_Tolerance_Ranges|Rubisco|Photorespiration
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students commonly associate the mitochondrion exclusively with ATP synthesis (due to its role in aerobic respiration).
The trap exploits this functional overlap by suggesting the mitochondrion synthesizes ATP during photorespiration, whereas the photorespiratory pathway is strictly an ATP-consuming, carbon-wasting process with zero ATP or NADPH yield.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Photosynthesis in Higher Plants - Class 11 |
| Concept | Rubisco Dual Functionality |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |