Science · Year 6

Active learning ideas

Digestive System: Fueling the Body

Active learning helps Year 6 students grasp the digestive system’s complexity because the process is invisible and sequential. By building models, simulating actions, and analyzing food labels, students turn abstract ideas into concrete understanding through movement, discussion, and observation. This hands-on approach strengthens memory and reveals the system’s interactions in real time.

• ACARA Content Descriptions
• ACARA Australian Curriculum v9: Science Year 5, Biological sciences, describe the key function of the digestive system in a range of animals, including humans (AC9S5U02)
• ACARA Australian Curriculum v9: Science Year 6, Science Inquiry, use a range of representations, including tables, graphs and models, to represent and summarise data from students’ own investigations and secondary sources (AC9S6I05)

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

Activity 01

• Simulation Game
• 45 min · Small Groups

Model Building: Digestive Tract Tube

Provide tubes, balloons, and zip-lock bags to represent esophagus, stomach, and intestines. Students add crackers, water, and dilute vinegar to simulate stages, squeezing to mimic peristalsis and observing breakdown. Discuss absorption using cheesecloth filters.

Explain the journey of food through the digestive system and its transformation.

Facilitation Tip

During Model Building, circulate and ask groups to verbally sequence their tubes while pointing to each stage, reinforcing the physical-to-verbal connection.

What to look for

Provide students with a diagram of the digestive system. Ask them to label 5 key organs and write one sentence describing the main function of each labeled organ.

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

Activity 02

• Simulation Game
• 30 min · Pairs

Enzyme Experiment: Cracker Digestion

Chew crackers without swallowing to mix with saliva amylase, then compare to dry crackers on timers. Students test variables like temperature using warm and cold water. Record changes in texture and taste to infer enzyme roles.

Analyze the role of different organs in breaking down food and absorbing nutrients.

Facilitation Tip

In the Enzyme Experiment, remind students to time the cracker pieces and observe saliva’s effect, linking the visual change to chemical digestion.

What to look for

Pose the scenario: 'Imagine the small intestine stopped absorbing nutrients. What would happen to the body?' Facilitate a class discussion, guiding students to connect nutrient absorption to energy, growth, and overall health.

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

Activity 03

• Simulation Game
• 35 min · Small Groups

Journey Role-Play: Food Particle Path

Assign roles to organs and a 'food particle' volunteer. Groups act out mechanical and chemical steps with props like gloves for teeth and pipettes for enzymes. Switch roles and predict what happens if one organ fails.

Predict the consequences of a malfunctioning organ in the digestive system.

Facilitation Tip

For Journey Role-Play, assign roles based on organs and have groups perform their actions in order, using props like a straw for the esophagus to reinforce the pathway.

What to look for

On an index card, have students draw a simple flowchart showing the journey of a bite of food through three major digestive organs. They should include a brief description of what happens to the food in each organ.

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

Activity 04

• Simulation Game
• 40 min · Pairs

Nutrient Hunt: Food Label Analysis

Examine packaged foods for carbs, proteins, fats. Students sort into digestive processes needed and trace to absorption sites. Create posters linking labels to body needs.

Explain the journey of food through the digestive system and its transformation.

Facilitation Tip

When analyzing food labels in Nutrient Hunt, ask students to calculate daily percentages of key nutrients and compare them to recommended intake, deepening their understanding of nutrient roles.

What to look for

Provide students with a diagram of the digestive system. Ask them to label 5 key organs and write one sentence describing the main function of each labeled organ.

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

A few notes on teaching this unit

Teachers should avoid long lectures about digestion; instead, let students experience each stage through guided discovery. Use analogies carefully, such as comparing the stomach to a washing machine, but follow up with precise vocabulary to prevent misconceptions. Research shows that combining movement, peer teaching, and immediate feedback builds lasting understanding of body systems. When students struggle, revisit the physical models to rebuild the sequence step-by-step.

Students will explain the digestive path from mouth to elimination, describe the role of enzymes and villi, and correct common misconceptions through evidence from their models and experiments. They will use accurate vocabulary and connect each stage to the body’s need for energy and growth.

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Watch Out for These Misconceptions

• During Model Building: Digestive Tract Tube, watch for students placing the stomach first or omitting the mouth and small intestine. Redirect by having them lay out their tubes in sequence and explain each organ’s role aloud.

  During Model Building, challenge groups to present their tubes in order, naming each part and its function before testing with a food item. If they place the stomach first, ask, ‘Where does food enter first? What happens there?’ to guide correction.

• During Enzyme Experiment: Cracker Digestion, watch for students attributing digestion only to chewing and not to saliva enzymes. Redirect by asking how the cracker changed after being mixed with saliva.

  During the Enzyme Experiment, ask students to compare a cracker piece chewed without saliva to one mixed with saliva. Point to the softened piece and ask, ‘What caused this change?’ to highlight the role of enzymes.

• During Journey Role-Play: Food Particle Path, watch for students describing absorption as happening in the stomach or large intestine. Redirect by having them act out the movement of particles and discuss where absorption actually occurs.

  During Journey Role-Play, pause after the stomach scene and ask, ‘Where do the tiny bits of food go next? What happens there?’ Use their actions to emphasize that absorption occurs in the small intestine with villi.

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Methods used in this brief

• Simulation Game