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Question #46030
The Question
An ecologist studying an open ocean ecosystem observes that the pyramid of biomass is inverted, with the standing crop of phytoplankton being significantly lower than that of the zooplankton. Regarding the ecological dynamics of this ecosystem, which of the following statements is INCORRECT?
Options
- A.
The standing crop of phytoplankton provides a direct measurement of the ecosystem's primary productivity.
- B.
The pyramid of energy remains strictly upright because energy is inevitably lost as heat during transfer to zooplankton.
- C.
The ecosystem is sustained because phytoplankton have a significantly higher turnover rate than the primary consumers.
- D.
The standing crop is most accurately quantified using dry weight rather than fresh weight to avoid water content fluctuations.
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
Phytoplankton|Zooplankton|Trophic Efficiency Limits
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often conflate 'Standing Crop' (static mass) with 'Productivity' (rate of energy flow).
The inverted aquatic biomass pyramid is the classic NCERT pedagogical trap that forces students to realize that a low standing crop can still mean high productivity if the turnover rate is rapid.
Failing to distinguish between a static measurement and a dynamic rate leads to selecting the wrong ecological conclusion.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Standing Crop quantification |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |