Science · Primary 4

Active learning ideas

Microorganisms: Bacteria and Fungi

Active learning connects students to the invisible world of microorganisms by making it tangible. Hands-on work with live cultures and models helps students see how bacteria and fungi operate in real time, turning abstract concepts into memorable experiences. When students observe growth, culture results, or simulation outcomes, they build lasting understanding of roles and impacts that textbooks alone cannot provide.

• MOE Syllabus Outcomes
• MOE Primary Science Syllabus 2023, Theme: Diversity, Classifying living things: Classify fungi and bacteria based on their characteristics
• MOE Primary Science Syllabus 2023, Theme: Diversity, Classifying living things: State the characteristics of fungi (e.g. feed on other organisms, reproduce by spores)
• MOE Primary Science Syllabus 2023, Theme: Diversity, Classifying living things: State the characteristics of bacteria (e.g. can be useful or harmful)

• 30–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Inquiry Circle
• 30 min · Small Groups

Observation Lab: Bread Mould Growth

Provide moist bread slices in sealed bags. Students predict growth over 3-5 days, sketch daily changes with hand lenses, measure mould spread, and note conditions like warmth. Conclude by classifying observations as fungal characteristics.

Explain the beneficial and harmful roles of bacteria in ecosystems and human health.

Facilitation Tip

During the Observation Lab, remind students to label plates with dates and initials to track mold growth patterns over time.

What to look for

Present students with images or descriptions of different microorganisms. Ask them to label each as 'Bacteria' or 'Fungi' and provide one characteristic that supports their classification. For example, 'This organism forms long threads and reproduces by spores, so it is a fungus.'

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 02

• Inquiry Circle
• 40 min · Pairs

Culture Station: Yogurt Bacteria

Pairs heat milk to 85°C, cool to 45°C, stir in yogurt starter, and incubate overnight. Next lesson, taste samples, discuss bacterial fermentation turning milk sour, and link to digestion benefits.

Compare the characteristics of bacteria and fungi.

Facilitation Tip

At the Culture Station, have students prepare two slides: one stained and one unstained, so they can compare bacterial shapes under the microscope.

What to look for

Pose the question: 'Imagine a world where common bacterial infections like strep throat could no longer be treated with antibiotics. What are two specific ways this would impact your daily life or the lives of people in your community?' Facilitate a class discussion, guiding students to consider healthcare, food safety, and general well-being.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 03

• Jigsaw
• 45 min · Small Groups

Jigsaw: Bacteria vs Fungi

Assign small groups one organism. They list traits, roles, and images on posters, then rotate to teach peers and complete comparison charts. Whole class shares key differences.

Predict the impact of widespread antibiotic resistance on human societies.

Facilitation Tip

For the Jigsaw Puzzle, assign each small group one category to research and present, ensuring all students contribute to the final comparison chart.

What to look for

On an index card, have students write down one example of a beneficial role of bacteria or fungi and one example of a harmful role. They should also write one sentence explaining why antibiotic resistance is a concern.

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Activity 04

• Simulation Game
• 35 min · Small Groups

Simulation Game: Antibiotic Resistance

Use beads as bacteria on trays. Students apply 'antibiotics' (remove colours) over rounds, showing survivors multiply. Discuss overuse impacts on health.

Explain the beneficial and harmful roles of bacteria in ecosystems and human health.

Facilitation Tip

In the Simulation Game, pause after each round to ask students to predict what will happen next and explain their reasoning aloud.

What to look for

Present students with images or descriptions of different microorganisms. Ask them to label each as 'Bacteria' or 'Fungi' and provide one characteristic that supports their classification. For example, 'This organism forms long threads and reproduces by spores, so it is a fungus.'

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

A few notes on teaching this unit

Teachers should pair direct instruction with inquiry, using demonstrations and guided questions to scaffold observations. Avoid overwhelming students with too many new terms at once; instead, focus on one concept per activity and connect it to prior knowledge. Research shows that students grasp structural differences better when they see cells under the microscope before discussing functions, so sequence activities to build from concrete to abstract.

By the end of these activities, students will confidently distinguish bacteria from fungi, explain at least two beneficial roles and two harmful roles, and describe how microorganisms influence ecosystems and health. They will use evidence from their observations to challenge assumptions and communicate findings clearly in discussions and written work.

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Watch Out for These Misconceptions

• During Culture Station: Yogurt Bacteria, watch for statements like 'This yogurt has bad bacteria because it smells sour.' Redirect by asking students to compare the yogurt culture to harmful bacteria examples and discuss why sourness signals fermentation, not spoilage.

  During Culture Station: Yogurt Bacteria, students should taste and observe the yogurt, noting its texture and smell. Use this to contrast beneficial fermentation with harmful spoilage, asking students to identify key differences in smell and appearance.

• During Observation Lab: Bread Mould Growth, watch for students calling mould a plant because it cannot move. Redirect by having them compare the mould’s thread-like structures to plant roots and ask how each absorbs nutrients.

  During Observation Lab: Bread Mould Growth, guide students to sketch the mould’s hyphae and discuss how these structures absorb nutrients from bread. Use the sketch to highlight that fungi absorb nutrients externally, unlike plants that photosynthesise.

• During Simulation Game: Antibiotic Resistance, watch for students saying 'microbes don’t really matter because we can’t see them.' Redirect by asking them to recall food spoilage or infections they have experienced and connect these to the simulation’s outcomes.

  During Simulation Game: Antibiotic Resistance, after each round, ask students to record how many 'healthy cells' remain and discuss how this relates to treating infections. Link the game’s results to real-world scenarios like strep throat treatment to make impacts visible.

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Methods used in this brief

• Inquiry Circle
• Jigsaw
• Simulation Game