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Question #46093
The Question
Read the following statements regarding the Diversity-Stability relationship and global conservation initiatives. Which of the following statements is INCORRECT?
Options
- A.
In Ehrlich's Rivet Popper Hypothesis, the extinction of a keystone species is analogous to losing a rivet on the airplane wing, causing a severe threat to ecosystem stability.
- B.
The World Summit on Sustainable Development (2002) in Johannesburg resulted in a pledge by 190 countries to completely halt the global rate of biodiversity loss by 2010.
- C.
According to David Tilman's long-term field experiments, plots with higher species richness showed less year-to-year variation in total biomass.
- D.
The initial loss of minor species, analogous to popping rivets on passenger seats, may not immediately compromise ecosystem stability due to functional redundancy.
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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
Ex-situ_Conservation|Co-extinction_Logic|Evil_Quartet_Drivers
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often gloss over the exact quantitative wording of international treaties in NCERT (e.g., Earth Summit vs.
World Summit, 'significant reduction' vs. 'complete halt').
The trap relies on a 'Common Half-Truth' where the summit, year, and location are correct, but the specific biological/policy target is exaggerated.
It also tests the synthesis of Tilman's empirical data and Ehrlich's theoretical analogy to explain why these summits are critical.
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 |