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12. Ecosystem

Ecosystems are characterized as functional units where living organisms interact with each other and their physical environment. They can be divided into terrestrial and aquatic categories, comprising distinct components that include producers, consumers, and decomposers. Four key processes define functionality: productivity, decomposition, energy flow, and nutrient cycling.

Sections

ECOSYSTEM

An ecosystem is a functional unit where living organisms interact with each other and their physical environment.

12 Section Overview

Start current section content and materials

12.1 Ecosystem–Structure and Function

An ecosystem is a functional unit of nature featuring the interaction of living organisms with each other and their physical environment.

12.2 Productivity

Productivity in ecosystems is determined by the rate of biomass production from photosynthesis, classified into gross and net primary productivity.

12.3 Decomposition

Decomposition is the vital process in ecosystems that recycles nutrients by breaking down complex organic matter into simpler substances.

12.4 Energy Flow

The section discusses the flow of solar energy through ecosystems, emphasizing the roles of producers and consumers in energy transfer.

12.5 Ecological Pyramids

Ecological pyramids illustrate the relationships of numbers, biomass, and energy flow at various trophic levels in ecosystems.

12.6 Summary

An ecosystem is a complex unit comprising biotic and abiotic components, crucial for understanding productivity, decomposition, energy flow, and nutrient cycling.

12.7 Exercises

This section provides a variety of exercises designed to reinforce understanding of ecosystems.

Learning Objectives

  • An ecosystem comprises abiotic and biotic components that interact regularly.

  • Productivity is the generation of organic matter through photosynthesis, categorized into gross and net primary productivity.

  • Decomposition is the breakdown of organic matter, which involves several key processes leading to nutrient recycling.

Key Concepts

Primary Production

The rate at which plants and autotrophs produce organic matter in an ecosystem, expressed as biomass produced per unit area over time.

Decomposition

The process by which decomposers break down dead organic material into inorganic substances, making nutrients available once again for autotrophs.

Energy Flow

The unidirectional movement of energy through an ecosystem from producers to various levels of consumers, governed by thermodynamic laws.

Ecological Pyramids

Graphical representations of the relationship between different trophic levels of an ecosystem in terms of number, biomass, or energy.

Practice Exercises

Total Questions

3

Estimated Time

6 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting