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Q16 (CDS-II/2021) Environment & Ecology › Ecology & Ecosystem Basics › Ecosystem concepts Answer Verified

While studying vegetation of an area, terms like ‘population’ and ‘community’ are often used. Which one of the following statements best describes a population ?

Result
Your answer: —  ·  Correct: A
Explanation

In ecology, a population is defined as a group of organisms belonging to the same species that occupy a specific geographical area at a given time [5]. This definition emphasizes three critical criteria: taxonomic identity (same species), spatial proximity (same area), and temporal coincidence (same time). Option 2 is incorrect as it describes seasonal distribution rather than the core ecological definition. Option 3 describes an ecosystem, which is a self-regulating association consisting of both biotic (living) and abiotic (non-living) components [3]. Option 4 describes a community, which comprises different populations of various species living and interacting together within the same habitat [4]. Therefore, the most accurate description of a population is a group of individuals of one species living in the same area at the same time, allowing for potential interbreeding and resource competition [5].

Sources

  1. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 12: How Nature Works in Harmony > Table 12.2: Number of particular organisms at a given space and time > p. 194
  2. [5] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 1: Ecology > r.3.2. Population > p. 4
  3. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 1: BASIC CONCEPTS OF ENVIRONMENT AND ECOLOGY > COMPONENTS OF AN ECOSySTEM. > p. 16
  4. [3] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Biotic: Living > p. 107
  5. [4] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 1: Ecology > Structure of a community > p. 5
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