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Question #45948
The Question
An ecologist studying a pelagic marine ecosystem observes that the standing crop of phytoplankton is 4 g/m², while the standing crop of zooplankton is 21 g/m². Despite this inverted biomass pyramid, the ecosystem is highly stable. Which of the following statements represents a FALSE ecological deduction regarding this ecosystem?
Options
- A.
The Net Primary Productivity (NPP) of the phytoplankton over an annual cycle is lower than the secondary productivity of the zooplankton.
- B.
The phytoplankton population exhibits an extremely high relative growth rate and rapid turnover compared to the zooplankton.
- C.
The pyramid of energy for this specific ecosystem remains strictly upright, adhering to the laws of thermodynamics.
- D.
The standing crop represents a mere snapshot of absolute biomass, failing to reflect the continuous and rapid consumption by higher trophic levels.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Inverted Biomass Pyramids|Absolute vs Relative Growth
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between 'Standing Crop' (instantaneous absolute biomass) and 'Productivity' (rate of biomass generation over time).
Students often falsely equate an inverted biomass pyramid with an inverted energy/productivity flow.
The trap relies on the misconception that a lower standing crop inherently means lower total productivity.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Absolute vs Relative Growth |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |