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Diagram of a terrestrial food chain showing plants as primary producers, eaten by herbivorous mammals and insects, which are consumed by small and large predators, with decomposers like fungi, bacteria, and earthworms recycling organic matter. An energy pyramid diagram showing four levels: producers like grass at the base, primary consumers such as rabbits above, secondary consumers like snakes next, and a tertiary consumer, an eagle, at the top. Arrows indicate energy transfer upward and energy loss at each level.
Discern between self-sustaining autotrophs and consumer heterotrophs and find their places in the food chain
How an ecosystem works: Producers, herbivores, and carnivores
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Diagram of a terrestrial food chain showing plants as primary producers, eaten by herbivorous mammals and insects, which are consumed by small and large predators, with decomposers like fungi, bacteria, and earthworms recycling organic matter.
terrestrial food chain The terrestrial food chain featuring producers, consumers, and decomposers.

In biology, producers, also known as autotrophs, form the base of the food chain. These organisms, primarily plants, algae, and phytoplankton, create their own food using energy from sunlight through a process called photosynthesis. They convert simple inorganic substances like carbon dioxide and water into energy-rich organic molecules, such as glucose. This stored energy is then passed on to other organisms when herbivores consume the producers, and subsequently to higher trophic levels as predators consume herbivores. Producers are essential for introducing energy into ecosystems and supporting all other life forms, which are consumers (heterotrophs) that depend on them directly or indirectly.12345

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6 Britannica Sources
  1. food: Top Questions
  2. community ecology - Autotrophs and heterotrophs
  3. marine ecosystem - The pelagic food chain
  4. food web
  5. plant - Basic mechanisms
  6. autotroph

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