Science · Primary 6

Active learning ideas

Biodiversity and Ecosystem Stability

Active learning works well for biodiversity and ecosystem stability because students must see connections between real species and their roles. When they manipulate food webs or observe school ecosystems firsthand, abstract ideas become concrete, helping them understand why diversity matters for survival.

• MOE Syllabus Outcomes
• MOE: Interactions within the Environment - S1

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Philosophical Chairs
• 45 min · Small Groups

Food Web Cards: Disruption Challenge

Provide cards representing species in a local ecosystem; students in groups connect them into a food web with string. Remove one species at a time and note collapsing links. Discuss how diversity prevents total breakdown.

Explain how high biodiversity contributes to ecosystem stability.

Facilitation Tip

During Food Web Cards, circulate and ask each group: 'Which card would you remove first to test stability? Why?' to push deeper reasoning.

What to look for

Present students with a scenario: 'A new construction project will remove a significant portion of a local forest.' Ask them to discuss in small groups: 1. What types of species might be lost? 2. How could the loss of even one species affect the remaining plants and animals? 3. What ecosystem services might be impacted?

• Analyze
• Evaluate
• Self-Awareness
• Social Awareness

Activity 02

• Philosophical Chairs
• 35 min · Pairs

School Biodiversity Audit: Pairs

Pairs survey a defined school area, tallying plant and insect species using identification guides. Create bar graphs comparing zones. Share findings to identify high-diversity spots.

Analyze the consequences of biodiversity loss on ecosystem services.

Facilitation Tip

For the School Biodiversity Audit, provide clipboards and magnifying glasses so students can document small organisms accurately.

What to look for

Provide students with a simplified food web diagram of a local ecosystem (e.g., a pond or forest patch). Ask them to identify one producer, one primary consumer, one secondary consumer, and one decomposer. Then, pose the question: 'If the population of the secondary consumer suddenly decreased by half, what are two possible effects on other organisms in this food web?'

• Analyze
• Evaluate
• Self-Awareness
• Social Awareness

Activity 03

• Philosophical Chairs
• 30 min · Whole Class

Keystone Species Role-Play: Whole Class

Assign roles as species in a pond ecosystem; one student acts as a keystone like an otter. Remove it and act out chain reactions on population sizes. Debrief on stability impacts.

Justify the importance of protecting endangered species for overall ecosystem health.

Facilitation Tip

In Keystone Species Role-Play, assign roles ahead of time so students prepare their arguments about species importance.

What to look for

On an index card, have students write: 1. One reason why protecting endangered species is important for ecosystem stability. 2. One example of an ecosystem service that benefits humans and is supported by biodiversity.

• Analyze
• Evaluate
• Self-Awareness
• Social Awareness

Activity 04

• Philosophical Chairs
• 25 min · Small Groups

Domino Stability Model: Small Groups

Groups arrange dominos as interdependent species chains. Topple single versus multiple dominos to compare recovery ease. Relate to biodiversity buffering effects.

Explain how high biodiversity contributes to ecosystem stability.

Facilitation Tip

With Domino Stability Model, remind groups to test removals twice: once with high diversity and once with low, to compare effects directly.

What to look for

Present students with a scenario: 'A new construction project will remove a significant portion of a local forest.' Ask them to discuss in small groups: 1. What types of species might be lost? 2. How could the loss of even one species affect the remaining plants and animals? 3. What ecosystem services might be impacted?

• Analyze
• Evaluate
• Self-Awareness
• Social Awareness

A few notes on teaching this unit

Teachers approach this topic by starting with local examples students can see, like school gardens or parks, to build relevance. Avoid overwhelming students with too many species at once; focus on 3-4 key roles per activity. Research shows that hands-on simulations help students grasp complex concepts better than lectures, so prioritize activities where they manipulate models or data.

Successful learning looks like students explaining how species interactions maintain balance, predicting outcomes of disruptions, and justifying why diverse ecosystems resist collapse. They should use evidence from activities to support their reasoning, not just recall facts.

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Watch Out for These Misconceptions

• During Food Web Cards, watch for students who assume ecosystems with fewer species are more stable because they seem 'simpler'.

  Have them remove one species from their food web and observe how many other populations are affected. Point out that in low-diversity webs, removals often cause chain reactions, while diverse webs absorb shocks more easily.

• During School Biodiversity Audit, listen for students who say only rare or 'cool' animals matter for ecosystem health.

  Ask them to tally decomposers or soil organisms they find, then discuss how these organisms recycle nutrients that all life depends on, including humans.

• During Keystone Species Role-Play, watch for students who assume ecosystems recover quickly from species loss without effort.

  After role-plays, debrief by asking: 'How long did recovery take in your simulation?' Then compare to real-world cases where invasive species filled gaps poorly.

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Methods used in this brief

• Philosophical Chairs