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Question #46661
The Question
An invasive alien plant species establishes itself in a native tropical forest. Ecological analysis reveals that its leaf litter contains an unusually high concentration of polyphenols and lignin compared to native species. According to the principles of ecosystem functioning and the 'Rivet Popper Hypothesis', which of the following best explains how this invasion will most likely compromise the stability of the ecosystem?
Options
- A.
It inhibits the catabolic activity of native decomposers, decelerating mineralization and disrupting the nutrient cycle required by native flora.
- B.
It accelerates the fragmentation and leaching steps of decomposition, leading to rapid nutrient depletion from the topsoil.
- C.
It promotes the rapid proliferation of native microflora, causing an excessive release of CO2 that alters the microclimate.
- D.
It directly increases the gross primary productivity (GPP) of the ecosystem, leading to competitive exclusion of native decomposers.
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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
Humus|Detritus|Microbial_Enzymes
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating the chemical control of decomposition (Ecosystem) with the functional consequences of alien species invasion (Biodiversity).
Common Misconception: Students often assume alien species only cause harm via direct physical competition for space or light (e.g., shading out native plants), failing to recognize 'litter-mediated' disruption of the Detritus Food Chain (DFC) and biogeochemical cycles as a profound driver of ecosystem collapse.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Ecosystem - Class 12 |
| Concept | Productivity Ratios |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |