The Food Chain

The Food Chain is a complex system of interrelated food sources in an ecosystem. It describes the flow of energy and nutrients from one organism to another, starting with producers (like plants) and ending with top predators.

Overview

The Food Chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. The levels in the food chain are called trophic levels. In a typical food chain, plants (the producers) are eaten by herbivores (primary consumers), which are then eaten by carnivores (secondary consumers). Top predators, also known as apex predators, are at the top of the food chain.

Trophic Levels

Each level in the food chain is called a trophic level. Organisms in the same trophic level have the same function in the food chain and the same nutritional relationship to the primary sources of energy.

Producers

Producers or autotrophs, make their own food using photosynthesis or chemosynthesis. They form the base of the food chain.

Consumers

Consumers or heterotrophs, cannot produce their own food and must consume other organisms. They are divided into primary, secondary, and tertiary consumers.

Decomposers

Decomposers break down dead organisms and waste products. They return nutrients to the soil, which can be used by producers.

Energy Flow

Energy flows through the food chain in one direction, from producers to consumers. This is known as the energy flow.

See Also

• Food web
• Ecology
• Biomass (ecology)

References

The Food Chain Resources
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