--- title: "Food Chains & Energy Transfer" description: "Construct and interpret food chains identifying producers, predators, and prey, and understand energy transfer between trophic levels" canonical: https://lightmysky.com/learn/science/food-chains-and-energy-transfer-mt_oB-L8EVdIP source: https://lightmysky.com/learn/science/food-chains-and-energy-transfer-mt_oB-L8EVdIP.md retrieved: 2026-11-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Food Chains & Energy Transfer Construct and interpret food chains identifying producers, predators, and prey, and understand energy transfer between trophic levels Subject: Science · Area: Ecosystems & Habitats · Ages 8 to 9 Page: https://lightmysky.com/learn/science/food-chains-and-energy-transfer-mt_oB-L8EVdIP ## Ready when they can - Construct a food chain with at least four organisms, labelling producer, primary consumer, predator - Define producer, predator, and prey with examples - Interpret a given food chain to predict what happens if one organism is removed ## Lesson: Energy Along a Food Chain You have used producer and consumer before. A food chain shows one feeding path. Plants and algae in our examples use sunlight to make food. They are producers. Consumers get food by eating. List organisms from food to eater. Count each listed organism once. Sunlight supplies energy but is not an organism. *(drawing: In this pond model, water fleas eat algae, small fish eat water fleas, perch eat small fish, and herons eat perch.)* The primary consumer eats the producer: here, the water flea eats algae. Count consumers by counting organisms that eat, leaving out the producer. A predator hunts another animal for food; prey is the animal it hunts. The small fish is predator of water fleas and prey for perch. The heron is the last predator shown, not proof that nothing hunts it elsewhere. Only some food energy becomes stored in an eater's body. Living things use energy and release heat. Some food is not eaten or digested. Less energy supports each later feeding level, or group of eaters. This helps limit chain length, without setting one fixed maximum. It compares whole feeding levels, not the energy inside individual animals. *(drawing: Each box shows one link. Arrows point from food to eater. Find the affected animal's food and its predators.)* If water fleas disappear, small fish lose one food source. Small-fish numbers could fall, leaving less food for perch. Losing a producer can also reduce food along its chain. Other foods may change the result, so these are possible changes rather than certain outcomes. If perch leave, fewer small fish may be hunted. Small-fish numbers could rise. More small fish could then eat more water fleas, reducing water-flea numbers. Other predators, food supplies and disease also matter. To predict a change, check both what an animal eats and what eats it. **Recap.** Food chains trace energy from food to eater. Less energy supports later feeding levels. Removing a link can affect its food and predators, but outcomes vary. *Lesson, questions and flashcards written for this dataset. Ecology references were consulted to check the science.* ## Practice 24 questions on this page, each with its working shown. ## Needs first - [Simple Food Chains](https://lightmysky.com/learn/science/simple-food-chains-mt_EygMHKs8Ed) - [Ecology Vocabulary](https://lightmysky.com/learn/science/ecology-vocabulary-mt_M7XhBBzYof) ## Optional connections - [Rainforest Food Webs](https://lightmysky.com/learn/science/rainforest-food-webs-mt_1LFVPjdGg-) - [Animal Nutrition](https://lightmysky.com/learn/science/animal-nutrition-mt_E1wR8IfCV6) - [Ocean Food Webs](https://lightmysky.com/learn/science/ocean-food-webs-mt_OnV_DTp5i8) ## Opens up - [Matter Cycling in Ecosystems](https://lightmysky.com/learn/science/matter-cycling-in-ecosystems-mt_0ajzcoKAKw) - [Insects in ecosystems](https://lightmysky.com/learn/science/insects-in-ecosystems-mt_r6oKXpN0er) - [Food Webs & Interdependence](https://lightmysky.com/learn/science/food-webs-and-interdependence-mt_URTJbS3hhs) - [Reading Food Web Diagrams](https://lightmysky.com/learn/science/reading-food-web-diagrams-mt_uVaS12lN1i)