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Home› UPSC CSE› Prelims GS Paper I› 2015 questions› Question 99

UPSC CSE Prelims

Subject: Environment & Ecology Chapter: Environment And Its Components

2015 PYQ

Question 99

Which one of the following is the best description of the term 'ecosystem'?

Choose one answer AA community of organisms interacting with one another BThat part of the Earth which is inhabited by living organisms CA community of organisms together with the environment in which they live DThe flora and fauna of a geographical area

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View correct answer and explanation

Correct answer: C

Correct Option: C Explanation: An ecosystem consists of a community of living organisms interacting with the nonliving physical environment through flows of energy and cycles of matter. Option-wise Analysis: A: Incorrect - A biological community alone omits the abiotic environment. B: Incorrect - The Earth-wide region inhabited by life is the biosphere, not a single ecosystem. C: Correct - An ecosystem includes organisms and their physical environment interacting together. D: Incorrect - Flora and fauna alone omit soils, water, climate and ecological processes.

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