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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper I, General Studies · Q1 of 120

Geo-Scientist Prelims 2020 General Studies Q1: Gause`s competitive exclusion principle states that two species:

QuestionEcology / competition

Gause`s competitive exclusion principle states that two species:

  1. (a) can coexist if they occupy the same niche.
  2. (b) cannot coexist if they occupy the same niche.
  3. (c) cannot coexist if they occupy the adjacent niches.
  4. (d) can coexist if they occupy similar niches.

Answer: (b) cannot coexist if they occupy the same niche.

Gause's principle (competitive exclusion): two species competing for the same limiting resources (same niche) cannot coexist indefinitely; one excludes the other. Coexistence needs niche differentiation (resource partitioning). Gause showed it with Paramecium aurelia and P. caudatum in culture.

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