2011 CSAT, all questions

UPSC Prelims 2011 · CSAT

Question 44: Reading Comprehension

Passage · as printed by UPSC
Passage beginning “A species that exerts an influence out…”Passage beginning “A species that exerts an influence out…”

What is the crux of the passage ?

aSea star has a preferred prey.
bA preferred prey determines the survival of a keystone species.
cKeystone species ensures species diversity.
dSea star is the only keystone species on the Pacific coast of North America.

UPSC published no Prelims answer keys before 2012.

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Source: UPSC, Civil Services (Preliminary) Examination 2011, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.