UPSC Prelims 2015 – Question 84

84.Which one of the following is the best description of
the term ‘ecosystem’?

1. a) A community of organisms interacting with one another
2. b) That part of the Earth which is inhabited by living organisms
3. c) A community of organisms together with the environment in which they live
4. d) The flora and fauna of a geographical area

The correct answer is Option 3. 

• Ecosystem: 
  • It is an interaction of all living and non-living organisms with the surrounding environment. Hence, Option 3 is correct. 
  • The different types of the ecosystem include: 
  • Terrestrial ecosystem 
  • Forest ecosystem 
  • Grassland ecosystem 
  • Desert ecosystem 
  • Tundra ecosystem 
  • Freshwater ecosystem 
  • Marine ecosystem 

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