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Producers, consumers and food chains

Ecology · Organisation of an ecosystem · note 1 of 6

Producers, consumers and food chainsSpec 4.7.2.1

Photosynthetic organisms are the producers of biomass for life on Earth. Feeding relationships within a community can be represented by food chains.

All food chains begin with a producer which synthesises molecules. This is usually a green plant or alga which makes glucose by photosynthesis.

Feeding levels in a food chain
NameWhat it doesExample
ProducerMakes glucose by photosynthesisGrass
Primary consumerEats the producerGrasshopper
Secondary consumerEats the primary consumerFrog
Tertiary consumerEats the secondary consumerSnake

Consumers that kill and eat other animals are predators, and those eaten are prey.

A food chain: grass, then grasshopper, then frog, then snake, with arrows pointing towards the animal that eats each one, labelled producer, primary consumer, secondary consumer and tertiary consumer.Tap to enlarge
The arrows show the direction the food (biomass) goes: from the food to the animal that eats it.