Before You Begin
Question #46070
The Question
In a terrestrial ecosystem, a keystone carnivore (T3) suffers co-extinction following the eradication of a specific plant species it requires for breeding. According to the principles of top-down regulation and ecological thermodynamics, what is the most likely consequence on the ecosystem's energy dynamics?
Options
- A.
The energy pyramid will become inverted because the unchecked primary consumers (T2) will temporarily accumulate more energy than the primary producers (T1).
- B.
The primary consumer (T2) population will erupt, causing severe overgrazing that collapses primary productivity (T1), drastically shrinking the absolute energy base of the upright pyramid.
- C.
The ecological efficiency between T1 and T2 will increase significantly beyond Lindeman's 10% limit to compensate for the energy flow disruption at the T3 level.
- D.
The standing crop of primary producers (T1) will increase due to the elimination of the ultimate top-down energy demand from the T3 trophic level.
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
Rivet Popper Hypothesis|Trophic Cascades|Top Predators
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse the potential inversion of 'Biomass Pyramids' (which can occur during pest eruptions or in aquatic ecosystems) with 'Energy Pyramids' (which strictly obey thermodynamic laws and can never invert).
Additionally, it tests the ability to accurately trace the alternating positive and negative impacts of a top-down trophic cascade (T3 down -> T2 up -> T1 down).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biodiversity and Conservation - Class 12 |
| Concept | Co-extinction Logic |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |