Notes for C4.2.10 Classification of organisms into trophic levels - IB | RevisionDojo
C4.2.10 Classification of organisms into trophic levels Notes
Classification of Organisms into Trophic Levels
Organisms are classified into trophic levels based on how they obtain energy and carbon compounds in food chains.
Organisms at the same level share similar energy acquisition methods.
Definition
Trophic level
A trophic level represents a group of organisms that share the same position in a food chain, based on how they obtain energy.
Example
Most consumers have varied diets and can occupy different trophic levels in various food chains.
For instance:
Red foxes (Vulpes vulpes) typically eat primary consumers, making them secondary consumers.
Self review
Can you explain why energy transfer between trophic levels is inefficient?
How does this limit the number of trophic levels in an ecosystem?
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How are organisms classified into trophic levels?
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Note
In every ecosystem, organisms are organized into different levels based on their role in the flow of energy. These levels help us understand who eats whom and how energy moves through the ecosystem.
Each step in a food chain represents a different trophic level, starting with producers and moving up to various levels of consumers.
Think of trophic levels like floors in a building: the ground floor is where everything starts (producers), and each higher floor represents a different group of organisms that rely on the level below for energy.
