Examkin

Question

Difficulty: MediumBasic Ecological Concepts and Ecosystem Structure

An ecologist monitored a freshwater pond and recorded the following observations:

1. A group of *Oreochromis niloticus* (Tilapia) feeding on floating algae near the surface.
2. Water lilies absorbing dissolved mineral nutrients and solar radiation.
3. Decomposing bacteria breaking down organic detritus on the muddy bottom.
4. Variations in water temperature, pH, and dissolved oxygen concentration throughout the day.

Which ecological concept is best described by the structural and functional interaction of all these living organisms together with their non-living physical environment?

  1. An ecosystemAnswer
  2. B
    An ecological niche
  3. C
    A biological community
  4. D
    A population

Answer

An ecosystem is the correct term representing the interactive system of biotic organisms and abiotic environmental factors.
An ecosystem is defined as a self-sustaining structural and functional unit formed by the interaction of a biological community (plants, animals, microorganisms) with its abiotic physical environment (water, light, temperature, chemical factors).

Step-by-Step Solution

1
Identify the components present in the pond observation.
The observations list biotic components (tilapia, water lilies, bacteria) and abiotic factors (temperature, pH, dissolved oxygen).
Determining whether both living organisms and physical environment are included helps define the level of ecological organization.
2
Distinguish between population, community, niche, and ecosystem.
A population includes one species; a community includes multiple interacting species; an ecological niche is a species' functional role; an ecosystem incorporates both the community and abiotic factors.
Comparing definitions isolates the unique requirement of abiotic-biotic integration.
3
Select the term that encompasses both biotic and abiotic interactions.
An ecosystem correctly describes this complete structural and functional unit.
The stem explicitly asks for the concept describing organisms interacting together with their non-living environment.

Key Concept

Levels of Ecological Organization and Ecosystem Components
Rate this question

Topics

Basic Ecological Concepts and Ecosystem Structure

More questions from this topic