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Difficulty: MediumBasic Ecological Concepts and Ecosystem Structure

An ecological survey of a mangrove swamp ecosystem identified four structural categories:

CategoryComponents
ISalinity, tidal flux, mud temperature, and dissolved gases
IIRed mangroves (*Rhizophora mangle*) and benthic diatoms
IIIFiddler crabs, mudskippers, and mangrove snails
IVShelf fungi, actinomycetes, and saprophytic bacteria

Which of the identified categories constitutes the autotrophic biotic component responsible for primary productivity in this ecosystem?

  1. A
    Category I
  2. Category IIAnswer
  3. C
    Category III
  4. D
    Category IV

Answer

Category II represents the autotrophic biotic component of the ecosystem.
The autotrophic biotic component of an ecosystem comprises primary producers—such as green plants (*Rhizophora mangle*) and photosynthetic microorganisms (diatoms)—that convert inorganic carbon dioxide and water into organic biomass using solar energy. In the provided survey, Category II uniquely contains these photosynthetic organisms.

Step-by-Step Solution

1
Identify the biological definition of an autotrophic biotic component in an ecosystem.
Autotrophs are living (biotic) organisms, such as green plants and photosynthetic algae, that synthesize complex organic substances from simple inorganic nutrients using light energy.
Ecosystem structure is divided into abiotic factors, autotrophic producers, heterotrophic consumers, and saprotrophic decomposers.
2
Analyze each category presented in the ecological survey table.
Category I represents abiotic factors. Category II contains photosynthetic autotrophs (red mangroves and diatoms). Category III contains heterotrophic animal consumers. Category IV contains saprophytic decomposers.
Classifying ecosystem components according to their nutritional and functional roles isolates the primary producers.
3
Match the autotrophic producer requirement to the correct category.
Category II is the autotrophic component.
Red mangroves and benthic diatoms undergo photosynthesis to generate primary biomass.

Key Concept

Basic Ecological Concepts and Ecosystem Structure (Autotrophic Producers)
Estimated Time:1m 0s
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Topics

Basic Ecological Concepts and Ecosystem Structure

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