The Living World: Foundations of Biology · 6th Year

Active learning ideas

Food Chains and Food Webs

Students learn best when they can physically manipulate and visualize the complex relationships in ecosystems. Active learning turns abstract energy flow into a tangible process, helping students see how every organism depends on others in real Irish habitats like hedgerows or bogs.

• NCCA Curriculum Specifications
• NCCA: Primary - Environmental Awareness and Care
• NCCA: Junior Cycle - Biological World

• 30–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Concept Mapping
• 35 min · Pairs

Card Sort: Local Food Web Build

Provide cards with local Irish species, arrows for energy flow, and labels for trophic levels. Students in pairs sort and connect cards into a food web on large paper, then label producers, consumers, and decomposers. Discuss as a class.

Construct a food web for a local ecosystem, identifying producers, consumers, and decomposers.

Facilitation Tip

During the Card Sort, ask students to explain their connections aloud before finalizing the web, reinforcing peer learning and correcting mistakes in real time.

What to look for

Present students with a list of 10 organisms found in a specific Irish habitat (e.g., a hedgerow). Ask them to select five and draw arrows to connect them, forming a simple food chain. Then, ask them to identify the producer and the top consumer in their chain.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

Activity 02

• Concept Mapping
• 45 min · Small Groups

Disruption Simulation: Species Removal

Groups construct a baseline food web with string linking species photos. Remove a key species like a hedgehog, then trace effects on connected organisms using colored markers. Predict population changes and share findings.

Predict the consequences for an ecosystem if a key species in its food web were removed.

Facilitation Tip

In the Disruption Simulation, have students write down their predictions before removing any species, then compare these to the actual ripple effects they observe.

What to look for

Pose the question: 'Imagine all the earthworms disappeared from your local park. What are three specific organisms that would be most affected, and why?' Facilitate a class discussion where students explain the ripple effects through the food web.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

Activity 03

• Concept Mapping
• 50 min · Small Groups

Decomposer Demo: Nutrient Cycle Jar

Layer soil, leaves, and worms in clear jars. Students observe weekly, recording decomposition and plant regrowth with added water. Compare jars with and without decomposers to note nutrient recycling.

Explain the critical role of decomposers in recycling nutrients within an ecosystem.

Facilitation Tip

For the Decomposer Demo, remind students to photograph the jar daily and note any changes in color or texture to track decomposition progress.

What to look for

Students receive a card with the term 'Decomposer'. They must write two sentences explaining what decomposers do and why their role is crucial for an ecosystem's long-term health, referencing nutrient recycling.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

Activity 04

• Concept Mapping
• 30 min · Pairs

Field Sketch: Schoolyard Web

Individuals sketch a simple food chain from school grounds, noting three levels plus decomposers. Pairs combine sketches into a class web on butcher paper, highlighting overlaps.

Construct a food web for a local ecosystem, identifying producers, consumers, and decomposers.

Facilitation Tip

When guiding the Field Sketch, provide clipboards and ask students to label producers, consumers, and decomposers directly on their drawings for clarity.

What to look for

Present students with a list of 10 organisms found in a specific Irish habitat (e.g., a hedgerow). Ask them to select five and draw arrows to connect them, forming a simple food chain. Then, ask them to identify the producer and the top consumer in their chain.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

A few notes on teaching this unit

Start with a brief whole-class discussion using local examples like a hedgerow or coastal dune to ground the concept in familiar ecosystems. Avoid starting with a lecture on trophic levels; instead, let students discover complexity through hands-on modeling. Research shows that students retain energy flow concepts better when they build models and test predictions rather than memorize terms.

By the end of these activities, students will confidently build accurate food webs, explain energy loss at each trophic level, and justify the critical role of decomposers. They will also predict ripple effects when species disappear, using clear evidence from their models and observations.

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Watch Out for These Misconceptions

• During the Card Sort activity, watch for students who arrange organisms in rigid, linear chains without cross-connections.

  Have students pause after their first draft and ask peers to suggest missing links, such as a hedgehog that eats both slugs and berries, to highlight the branching nature of real food webs.

• During the Disruption Simulation, watch for students who believe energy increases as it moves up the food chain.

  Give each student 10 tokens to represent energy at the producer level, then have them pass only 1 token up each link while setting aside the rest as 'lost heat', making the 10 percent rule visible and concrete.

• During the Decomposer Demo, watch for students who dismiss decomposers as unimportant or unrelated to producers.

  Ask students to predict what will happen to the soil in their jar after a week and compare it to a control jar without decomposers, using observations to show how nutrient recycling sustains plant growth.

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Methods used in this brief

• Concept Mapping