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Question #46656
The Question
Consider the thermodynamic constraints on energy transfer in an ecosystem. Which of the following statements regarding productivity and energy flow is INCORRECT?
Options
- A.
Secondary productivity is defined as the rate of formation of new organic matter by consumers.
- B.
The respiratory loss (R), expressed as a percentage of assimilated energy, decreases progressively at higher trophic levels to maximize energy transfer.
- C.
The ratio of secondary productivity of an apex predator to the ecosystem's Gross Primary Productivity (GPP) is extremely low due to cumulative metabolic costs.
- D.
The 10% energy transfer rule is an average estimate; actual net production efficiency often falls below this at higher trophic levels due to high maintenance costs.
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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
Stratification Efficiency|Primary Succession Facilitation|Ecological Succession Climax
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often misapply Lindeman's 10% law, assuming energy loss is a fixed constant or that organisms adapt to lower energy availability by reducing respiratory losses.
The trap lies in the metabolic cost of respiration; as organisms become larger and more active (Apex Predators), the respiratory cost per unit of biomass increases, rendering the 10% efficiency rule a generous overestimate at higher levels.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Stratification Efficiency |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |