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Question #46089
The Question
The introduction of the Nile Perch into Lake Victoria is a classic exemplar of biodiversity loss. In the context of the 'Evil Quartet' and the in-situ conservation goals of the Earth Summit (1992), which of the following statements regarding the ecological fallout of this event is INCORRECT?
Options
- A.
The extinction of over 200 endemic cichlid species represents a severe loss of genetic diversity, directly undermining the mandates of the Convention on Biological Diversity.
- B.
The decimation of algae-grazing cichlids disrupted the aquatic food web, triggering a trophic cascade that accelerated eutrophication in the lake ecosystem.
- C.
The event primarily illustrates 'Co-extinction', as the introduction of the Nile Perch caused the simultaneous collapse of obligate mutualistic networks within the lake.
- D.
The resulting ecological imbalance and nutrient enrichment created a biological feedback loop that facilitated the secondary invasion of aquatic weeds like Eichhornia crassipes.
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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
Liquid_Nitrogen|Decomposition_Rate_Modifiers|Seed_Viability
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between the specific mechanisms of the 'Evil Quartet'.
Students often conflate 'Co-extinction' (which implies a cascading loss of species) with the 'trophic cascade' caused by an 'Alien species invasion'.
While the Nile Perch caused multiple species to go extinct, the primary driver is alien predation, not the loss of an obligate mutualist host.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biodiversity and Conservation - Class 12 |
| Concept | Ex-situ Conservation Techniques |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |