Science · Year 7

Active learning ideas

Food Chains and Food Webs

Active learning turns abstract energy flow into concrete understanding. Students physically move organisms, energy cards, and yarn to see how energy moves one way and how webs collapse when parts are removed. These movements create lasting mental models that static diagrams cannot.

• ACARA Content Descriptions
• AC9S7U02

• 20–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Build Australian Food Webs

Prepare four stations with organism cards for reef, forest, desert, and wetland ecosystems. Groups draw arrows to link trophic levels, label energy flow, and note percentages. Rotate every 10 minutes, then share one prediction per station with the class.

Construct a complex food web for a specific Australian ecosystem.

Facilitation Tip

During Station Rotation: Build Australian Food Webs, place printed organism cards and arrows on desks so students can rearrange them multiple times to test different web configurations before settling on a final version.

What to look for

Provide students with a list of 10-15 organisms from an Australian ecosystem (e.g., Kakadu National Park). Ask them to draw arrows between organisms to create a food web and label at least three different trophic levels. Check for correct arrow direction indicating energy flow.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Simulation Game
• 30 min · Whole Class

Yarn Web Simulation: Population Impact

Students stand in a circle holding yarn as organisms in a web, with tension showing connections. One student drops yarn to simulate extinction, observing ripples. Discuss and record chain reactions on worksheets.

Analyze the flow of energy through different trophic levels in a food chain.

Facilitation Tip

During Yarn Web Simulation: Population Impact, have students stand in a circle and pass the yarn only after stating the energy relationship between organisms to prevent random connections.

What to look for

Present a scenario: 'Imagine a disease significantly reduces the population of kangaroos in an Australian grassland ecosystem. Discuss with a partner: What are two other populations that would likely be affected, and how would they be affected? Explain your reasoning using food web concepts.'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Simulation Game
• 25 min · Pairs

Pairs: Energy Pyramid Card Sort

Provide cards with organisms, energy values, and trophic labels. Pairs sort into pyramids for two ecosystems, calculate total energy loss, and justify placements. Pairs then critique a partner's pyramid.

Predict how changes in one population might affect other populations within a food web.

Facilitation Tip

During Pairs: Energy Pyramid Card Sort, remind students to calculate energy loss by writing percentages on each pyramid level card as they build, reinforcing the 10 percent rule visibly.

What to look for

Students write down one producer, one primary consumer, and one secondary consumer found in an Australian desert ecosystem. They then write one sentence explaining the energy transfer between two of the organisms they listed.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 04

• Simulation Game
• 20 min · Individual

Individual: Web Disruption Analysis

Give printed food webs of Australian bush. Students predict and draw outcomes of removing one species at three trophic levels, then compare with class data.

Construct a complex food web for a specific Australian ecosystem.

Facilitation Tip

During Individual: Web Disruption Analysis, provide colored pencils so students can trace energy paths before and after disruption, making changes visible and discussion-ready.

What to look for

Provide students with a list of 10-15 organisms from an Australian ecosystem (e.g., Kakadu National Park). Ask them to draw arrows between organisms to create a food web and label at least three different trophic levels. Check for correct arrow direction indicating energy flow.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Teach this topic by moving from simple chains to complex webs, using physical models before diagrams. Avoid starting with textbook explanations; instead, let students experience imbalance through hands-on activities. Research shows that students learn energy flow best when they physically handle materials and see imbalance, not when they memorize percentages from slides.

Students will demonstrate accurate trophic labeling, correct energy flow direction, and clear understanding of population interdependencies in Australian ecosystems. They will explain energy loss between levels and predict web impacts from disruptions.

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Watch Out for These Misconceptions

• During Pairs: Energy Pyramid Card Sort, watch for students who arrange pyramid levels in equal sizes or stack organisms randomly.

  Have students calculate energy at each level by writing the original energy value (e.g., 10,000 kJ) on the producer card, then divide by 10 for each higher level, taping the results to the cards before stacking to make imbalance visible.

• During Yarn Web Simulation: Population Impact, watch for students who believe any organism can connect to any other.

  Require students to state the energy relationship aloud before passing yarn, and have the teacher circulate to correct misconnections immediately using the organism cards as reference.

• During Station Rotation: Build Australian Food Webs, watch for students who recycle energy as if it moves in a circle.

  Ask students to trace energy paths with their fingers and note that arrows always point from food to eater, never back, reinforcing the one-way flow concept through repeated physical tracing.

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Methods used in this brief

• Stations Rotation
• Simulation Game