2011 CSAT, all questions

UPSC Prelims 2011 · CSAT

Question 47: 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…”

Consider the following assumptions :

  1. 1.The food chains/food web in an ecosystem are influenced by keystone species.
  2. 2.The presence of keystone species is a specific characteristic of aquatic ecosystems.
  3. 3.If the keystone species is completely removed from an ecosystem, it will lead to the collapse of the ecosystem.

With reference to the passage, which of the above assumptions is/are valid ?

a1 only
b2 and 3 only
c1 and 3 only
d1, 2 and 3

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.