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These are regarded as major causes of biodiversity loss: A. Over exploitation B. Co-extinction C. Mutation D. Habitat loss and fragmentation E. Migration Choose the correct option:
The Evil Quartet comprises: 1) Habitat loss and fragmentation, 2) Over-exploitation, 3) Alien species invasion, 4) Co-extinction. Endemism is NOT a cause of extinction!
NCERT designates the four major causes of accelerated species extinction as 'The Evil Quartet': 1. Habitat loss and fragmentation 2. Over-exploitation 3. Alien species invasions 4. Co-extinctions
- Statement A (Over-exploitation): Included in the Quartet. - Statement B (Co-extinction): Included in the Quartet. - Statement C (Endemism): Refers to species confined to a particular area; not a destructive cause. - Statement D (Habitat loss and fragmentation): The most important cause in the Quartet.
Statements A, B, and D represent Evil Quartet causes, giving A, B and D only (Option 2).
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Includes Endemism (C) which is not a threat/cause of extinction.
Correctly identifies three legitimate components of the Evil Quartet.
Includes Endemism (C) and omits Over-exploitation (A).
Includes Endemism (C) and omits Habitat loss and fragmentation (D).
Assuming endemic species are causes of extinction because hotspots have high endemism.
"There are four major causes ('The Evil Quartet' is the sobriquet used to describe them): (i) Habitat loss and fragmentation (ii) Over-exploitation (iii) Alien species invasions (iv) Co-extinctions."
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