What is a Food Chain?

How energy is passed through living things can be described as a food chain. Journey through a food chain, from primary producers at the bottom to tertiary consumers at the top. Biology - Ecosystems - Learning Points. A 'food chain' describes how energy derived from the Sun passes between living things. Producers are plants that harness the Sun's energy and convert it to sugars. Primary consumers, or herbivores, feed directly on the plants. Secondary consumers, or carnivores, feed on other animals. At different stages of the chain, some of the original energy is lost - this is often represented as pyramid of biomass. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.