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Question #46679
The Question
Consider the pioneer stage of hydrarch succession in a pelagic ecosystem where the pyramid of biomass is observed to be inverted. Which of the following statements regarding the energy flow and biomass accumulation in this ecosystem is INCORRECT?
Options
- A.
The standing crop of phytoplankton is lower than that of zooplankton due to their rapid turnover and high consumption rates.
- B.
Despite the inverted biomass pyramid, the pyramid of energy for this ecosystem remains strictly upright.
- C.
The low standing crop of phytoplankton indicates a correspondingly low Net Primary Productivity (NPP) at the producer level.
- D.
The energy flux through the phytoplankton population is sufficient to support the higher trophic levels despite their lower instantaneous biomass.
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
Evil Quartet|Nutrient Cycling|Ecosystem Function
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The distinction between a static measurement (Standing Crop) and a rate measurement (Productivity).
Common Misconception: Students often assume that a low standing crop (small biomass at a given moment) inherently means low productivity.
In aquatic systems with inverted biomass pyramids, the rapid turnover creates a 'standing crop illusion' where high energy flux (NPP) is masked by rapid consumption, confusing the identification of successional progression.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Nutrient Cycling Reservoirs |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |