Energy Flow Ecosystems

Overview

Students learn how energy moves through ecosystems by connecting organisms through a food chain and then expanding to a food web using movement-based collaboration. They will use clear explanations and logical organization to show producers, consumers, and decomposers.

Learning intentions

• Students will explain how energy moves from the Sun to producers to consumers to decomposers.
• Students will construct a food chain with correct order and energy-flow direction.
• Students will collaborate to build a food web that includes multiple energy pathways.
• Students will justify what could happen if one organism were removed from an ecosystem.

Success criteria

• I can identify a producer, consumer, and decomposer in my group’s ecosystem.
• I can draw or assemble a food chain in the correct energy-flow order with arrows.
• I can describe how energy moves through a food chain and food web.
• I can explain at least one effect on the ecosystem if an organism disappears.

Curriculum links

• Reading: Informational Text — Students comprehend grade-appropriate informational ideas about ecosystems and energy flow to support explanations.
• Writing: Text organization (CCSS.ELA-LITERACY.W.5.1a) — Students introduce and organize ideas logically to support their purpose (food chain/web explanation).
• Writing: Topic and structure (CCSS.ELA-LITERACY.W.5.2a) — Students use headings/labels and diagrams (food chain/web) to aid comprehension.
• Speaking & Listening — Students present roles in a sequence, using facts and descriptive details.
• Writing — Students produce work over short time frames with revisions/feedback during activity and checks.

Lesson structure (45 minutes)

1. 0–5 min · Hook question. Teacher asks: “How does a hawk get the energy it needs to survive?” and directs students to turn-and-talk with a partner. Students share initial ideas, using their own words, then listen for the day’s goal: becoming a living food web.

2. 5–12 min · Mini-lesson: energy pathway. Teacher explains the core model: Sun → Producer → Consumer → Decomposer, emphasizing each role (producers make their own food, consumers get energy by eating, decomposers break down dead organisms and return nutrients). Students sketch the model in their science notebook (quick diagram) and repeat the sequence chorally once to build shared language.

3. 12–20 min · Guided practice: build a sample chain. Teacher volunteers 5–6 students to stand in a line as the sample chain: Sun → Grass → Grasshopper → Frog → Snake → Hawk, then uses yarn/arrows to show energy movement from one role to the next. Students observe and help revise the order when needed; the class agrees on which organisms are producers/consumers/decomposers (note decomposers conceptually as “after death” even if not in the line).

4. 20–33 min · Collaborative practice: create the food web. Teacher assigns groups and gives each group organism cards, a food web recording sheet, yarn/arrows, and energy-flow direction prompts. Students (in groups) complete steps: identify producers, consumers, and decomposers; connect multiple feeding relationships with arrows; and write 1–2 sentences describing energy flow through their web.

5. 33–42 min · Movement-based food web. Teacher labels a “food web space” and places one card on each student’s chest (or group representative if needed). Teacher reminds: stand safely, listen for directions, and move only when cued. Students physically link with yarn/arrows when a feeding relationship exists (energy flows from eaten-by to eater following arrows shown by the teacher), then respond to the prompt “What might happen if one organism were removed?” by predicting changes in their connections.

6. 42–45 min · Exit ticket and wrap. Teacher asks: “What would happen to an ecosystem if one important organism disappeared?” and collects exit tickets. Students write a short response using at least two correct roles (producer/consumer/decomposer) and one idea about how energy flow would be affected.

Resources

• Organism cards (producers, consumers, decomposers; include options students can explain)
• Food web recording sheets (blank diagrams with labels/arrow guides)
• Yarn/string and arrow cards
• Science notebooks or scrap paper for quick sketches
• Timer for transitions
• Exit ticket slips
• Chart paper or board for the sample chain diagram
• Sentence starter strips (optional): “A ___ is a producer because…”, “If the ___ disappeared, then…”

Assessment

• Teacher observation checklist during movement: role clarity, correct direction of energy flow, safe participation, collaboration.
• Group scoring of food web recording sheets: correct identification of producer/consumer/decomposer and arrows showing direction of energy flow.
• Exit ticket: rubric-style quick check for at least one accurate ecological cause-and-effect statement.

Differentiation

• Support: pre-select organism cards for students who need scaffolding; provide partially completed food chains/webs with missing arrows or labels.
• Support: provide sentence starters for explanations of producers, consumers, and decomposers and for the “organism removed” prediction.
• Modification for non-movers: student organizes cards on a table, assigns arrow direction, and directs a partner who performs the movement.
• Extension: advanced students create a more complex food web with additional pathways (multiple predators or alternative food sources) and explain one backup pathway if an organism is removed.

Homework

• Students draw a simple food chain from an ecosystem of their choice and label producer, consumer(s), and decomposer (or note decomposers as “after death” in a brief caption).