NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Biology
- Chapter
- Chapter
NEET 2026 · Biology · Chapter
Read the following events and identify which of them represent the...
Read the following events and identify which of them represent the components of the 'Evil Quartet' responsible for the loss of biodiversity:
A. Extinction of Steller's sea cow due to human activities
B. Introduction of Nile perch into Lake Victoria
C. Protection of sacred groves in Meghalaya
D. Extinction of a host fish species leading to the loss of its unique parasites
E. Cryopreservation of gametes of threatened species
Choose the correct option:
A. Extinction of Steller's sea cow due to human activities
B. Introduction of Nile perch into Lake Victoria
C. Protection of sacred groves in Meghalaya
D. Extinction of a host fish species leading to the loss of its unique parasites
E. Cryopreservation of gametes of threatened species
Choose the correct option:
Options
- AA, B, C and D only
- BA, B and D only
- CB, C, D and E only
- DA, C and E only
Correct answer
B. A, B and D only
Step-by-step solution
The 'Evil Quartet' describes the four major causes of biodiversity loss: habitat loss and fragmentation, over-exploitation, alien species invasions, and co-extinctions.
Statement A represents over-exploitation, as Steller's sea cow became extinct due to excessive hunting by humans.
Statement B represents alien species invasion, as the introduction of the Nile perch into Lake Victoria led to the extinction of more than 200 species of native cichlid fish.
Statement C represents in-situ conservation, which protects biodiversity rather than causing its loss.
Statement D represents co-extinction, where the extinction of a host species inevitably leads to the extinction of the parasites dependent on it.
Statement E represents ex-situ conservation, which is a method to preserve threatened species.
Therefore, only statements A, B, and D represent components of the 'Evil Quartet'.
Answer: A, B and D only
Statement A represents over-exploitation, as Steller's sea cow became extinct due to excessive hunting by humans.
Statement B represents alien species invasion, as the introduction of the Nile perch into Lake Victoria led to the extinction of more than 200 species of native cichlid fish.
Statement C represents in-situ conservation, which protects biodiversity rather than causing its loss.
Statement D represents co-extinction, where the extinction of a host species inevitably leads to the extinction of the parasites dependent on it.
Statement E represents ex-situ conservation, which is a method to preserve threatened species.
Therefore, only statements A, B, and D represent components of the 'Evil Quartet'.
Answer: A, B and D only