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Difficulty: HardBasic Ecological Concepts and Ecosystem Structure

An ecological survey of a protected forest reserve recorded four distinct ecological observations:

ObservationDescription
IAll individuals of the mahogany tree (*Khaya senegalensis*) inhabiting a designated 15–hectare15\text{--hectare} plot.
IIThe combined populations of green plants, fruit bats, soil fungi, and earthworms interacting within the forest floor layer.
IIIThe physical soil minerals, ambient humidity, temperature, and solar radiation combined with all living organisms in the reserve.
IVThe specific micro-habitat conditions and nutritional role occupied by the pangolin (*Phataginus tricuspis*) as an ant-eating nocturnal mammal.

Which of the following correctly matches observations I, II, III, and IV to their corresponding levels of ecological organization and concepts?

  1. I = Population, II = Community, III = Ecosystem, IV = NicheAnswer
  2. B
    I = Community, II = Ecosystem, III = Biome, IV = Habitat
  3. C
    I = Population, II = Ecosystem, III = Biosphere, IV = Habitat
  4. D
    I = Species, II = Community, III = Ecosystem, IV = Habitat

Answer

Observation I corresponds to a Population, II to a Community, III to an Ecosystem, and IV to a Niche.
The correct option accurately distinguishes between the hierarchical tiers of ecological organization. A single species group in a defined region represents a population (I); the assembly of all living species forms a community (II); the combined biotic community and abiotic physical factors constitute an ecosystem (III); and the specific functional role and feeding behavior of an organism defines its ecological niche (IV).

Step-by-Step Solution

1
Analyze Observation I
Observation I describes a group of organisms belonging to the same species (*Khaya senegalensis*) inhabiting a specific geographic area at the same time.
By definition, a group of individuals of one species in a given area constitutes a Population.
2
Analyze Observation II
Observation II includes plants, animals, fungi, and earthworms (multiple species populations) interacting in one area without specifying non-living physical factors.
An assemblage of different interacting populations of organisms in a given habitat forms a Ecological Community.
3
Analyze Observation III
Observation III combines both living organisms (biotic factors) and non-living physical/chemical elements (abiotic factors such as soil minerals, humidity, temperature, solar radiation).
A community interacting with its non-living physical environment forms an Ecosystem.
4
Analyze Observation IV
Observation IV describes the functional position, feeding habits, and specific environmental adaptations of the ant-eating pangolin.
The complete functional role, position, and behavioral lifestyle of an organism within its environment defines its Ecological Niche.

Key Concept

Levels of Ecological Organization and Functional Differentiation
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Topics

Basic Ecological Concepts and Ecosystem Structure

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