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Question #47468
The Question
In a pelagic marine ecosystem, the pyramid of biomass is typically inverted, where a small standing crop of phytoplankton supports a much larger standing crop of zooplankton. Which of the following statements regarding the ecological and thermodynamic dynamics of this system is INCORRECT?
Options
- A.
The phytoplankton compensate for their low standing crop through a rapid turnover rate, functioning as a high-throughput energy system.
- B.
The pyramid of energy for this ecosystem remains strictly upright, as energy flow is unidirectional and subject to respiratory losses.
- C.
Due to the larger standing crop of consumers, the secondary productivity of the zooplankton must exceed the net primary productivity (NPP) of the phytoplankton over an annual cycle.
- D.
The standing crop is measured as the mass of living material at a specific time, which is a static metric that does not reflect the high reproductive rate of the producers.
Check Your Answer
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
Primary_Producers|Phytoplankton|Energy_Transfer
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse 'Standing Crop' (a static snapshot of biomass) with 'Productivity' (the rate of energy/biomass accumulation over time).
The trap exploits the intuitive but flawed logic that a larger consumer biomass implies a higher consumer productivity.
In reality, the high turnover rate of phytoplankton ensures their NPP vastly exceeds the zooplankton's secondary productivity, maintaining an upright energy pyramid despite the inverted biomass pyramid.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Neural Control and Coordination - Class 11 |
| Concept | Ipsilateral vs Contralateral Signaling |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |