Before You Begin
Question #46050
The Question
An aquatic ecosystem (with an inverted pyramid of biomass) and a terrestrial forest (with an upright pyramid of biomass) both experience a sudden environmental stress that drastically reduces the reproductive turnover rate of their primary producers, without immediately killing the existing standing crop. According to ecosystem dynamics and the Rivet Popper Hypothesis, which of the following correctly predicts the outcome?
Options
- A.
The terrestrial forest will collapse faster because its upright pyramid dictates a higher absolute energy demand by top carnivores that cannot be met.
- B.
Both ecosystems will collapse simultaneously because the 10% law of energy transfer is strictly dependent on immediate gross primary productivity.
- C.
The aquatic ecosystem will collapse faster because it relies on a rapid turnover rate of phytoplankton to support higher trophic levels, lacking a large standing crop buffer.
- D.
The aquatic ecosystem will exhibit greater resilience because its inverted biomass pyramid implies that higher trophic levels store sufficient energy to survive prolonged deficits.
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
Z-value in Large Areas|Alien Species Invasion Impacts|Species-Area Relationship
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse 'Standing Crop' (biomass at a specific time) with 'Productivity' (rate of biomass generation).
The trap assumes that because aquatic ecosystems have an inverted biomass pyramid, the higher trophic levels are somehow self-sustaining or heavily buffered.
The key realization is that inverted pyramids are highly fragile and maintained exclusively by hyper-fast producer turnover rates, making them paradoxically more sensitive to productivity drops than terrestrial forests.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biodiversity and Conservation - Class 12 |
| Concept | Rivet Popper Hypothesis |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |