Science · Grade 6

Active learning ideas

Threats to Biodiversity

Active learning works because threats to biodiversity are often invisible in daily life yet deeply interconnected with human choices. Hands-on activities let students see abstract concepts like habitat fragmentation or chemical runoff through concrete models and real-world examples, making the science personally relevant and memorable.

• Ontario Curriculum Expectations
• MS-LS2-4

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

Activity 01

• Simulation Game
• 35 min · Pairs

Simulation Game: Habitat Loss Model

Provide students with paper ecosystems marked into habitat patches. Have pairs remove sections to simulate deforestation or roads, then place species cards and track population changes over 'generations' by moving cards. Discuss fragmentation effects on migration.

Explain how human activities contribute to habitat loss and fragmentation.

Facilitation Tip

During the Habitat Loss Model, circulate with questions like, 'Which species survived? Why did their population drop?' to push students to connect cause and effect.

What to look for

Pose the question: 'Imagine you are a city planner. How would you balance the need for new housing with the protection of local wildlife habitats?' Facilitate a class discussion where students share their proposed solutions and justify their choices.

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

Activity 02

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Pollution Impacts

Set up stations for air, water, and soil pollution: use food coloring in water for runoff, smoke in jars for air, and oil in dirt for soil. Small groups test effects on model organisms like beans or brine shrimp, record data, and rotate. Conclude with class share-out.

Compare the impacts of different types of pollution on aquatic and terrestrial ecosystems.

Facilitation Tip

For the Pollution Impacts station rotation, assign each group a different pollutant so they can later teach others about its unique pathways and effects.

What to look for

Provide students with short case studies describing different environmental scenarios (e.g., a new highway cutting through a forest, a factory releasing chemicals into a river, a garden centre selling a popular non-native plant). Ask students to identify the primary threat to biodiversity in each case and briefly explain its impact.

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

Activity 03

• Case Study Analysis
• 50 min · Small Groups

Case Study Analysis: Invasive Species Debate

Assign invasive species like Asian carp or garlic mustard to small groups. Groups research ecological and economic impacts using provided articles, prepare pros/cons arguments, then debate whole class. Vote on management strategies.

Assess the ecological and economic consequences of invasive species in a new environment.

Facilitation Tip

In the Invasive Species Debate, assign roles clearly so quieter students can argue for economic benefits while others focus on ecological harm.

What to look for

On a slip of paper, ask students to write down one human activity that threatens biodiversity and one action they or their community could take to reduce that threat. Collect these to gauge understanding of cause and effect.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Activity 04

• Case Study Analysis
• 30 min · Pairs

Field Investigation: Local Threats

Students survey schoolyard or nearby park for signs of habitat loss, pollution, or invasives using checklists. In pairs, photograph evidence, categorize threats, and propose solutions in a shared class report.

Explain how human activities contribute to habitat loss and fragmentation.

Facilitation Tip

During the Field Investigation, bring clipboards and colored pencils so students can sketch threats they observe and label their impacts on a simple map.

What to look for

Pose the question: 'Imagine you are a city planner. How would you balance the need for new housing with the protection of local wildlife habitats?' Facilitate a class discussion where students share their proposed solutions and justify their choices.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

A few notes on teaching this unit

Teaching this topic effectively means starting with students' direct experiences before layering in complexity. Avoid overwhelming them with global statistics right away; instead, ground lessons in local examples they can relate to. Research shows that when students investigate real places, they retain concepts longer and feel more agency to make changes. Model skepticism about quick fixes, like blaming all problems on 'bad people'—instead, guide them to analyze systems where multiple factors interact.

Successful learning looks like students using evidence from simulations, discussions, and case studies to explain how human actions disrupt ecosystems. They should connect observations to broader concepts, propose solutions that balance human needs with ecological health, and reflect on their own role in these systems.

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Watch Out for These Misconceptions

• During the Pollution Impacts station rotation, watch for students assuming pollution only harms aquatic ecosystems.

  Use the soil and plant stations to demonstrate how acid rain damages forests and agricultural runoff poisons terrestrial food webs. After observations, ask groups to present 'unexpected' effects they discovered to challenge the aquatic-only view.

• During the Invasive Species Debate, watch for students claiming invasive species have no predators so they always dominate.

  In role-play, assign some students to be 'diseases' or 'new competitors' that invasive species must overcome. After simulations, have groups revise their arguments based on evidence from the role-play to correct the oversimplified predator-free assumption.

• During the Habitat Loss Model simulation, watch for students focusing only on logging as the main cause of habitat loss.

  Use the model to show how roads, farms, and housing developments each fragment habitats in different ways. After the activity, ask students to map their own daily routes and identify how their routines contribute to fragmentation, broadening their perspective beyond logging alone.

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Methods used in this brief

• Simulation Game
• Stations Rotation
• Case Study Analysis