Rubbish and Ecosystems

Overview

In this lesson, students investigate how rubbish affects wetland ecosystems and how living things respond. They connect scientific explanations about ecosystems with decision-making about actions that could reduce harm.

Learning intentions

Students will:

• explain how people’s choices about rubbish can affect habitats and feeding relationships in wetland ecosystems
• describe how different organisms may be impacted by rubbish and waste materials
• consider possible effects of different clean-up and waste-reduction actions
• communicate findings using clear, science-focused explanations

Success criteria

Students can:

• identify producers, consumers and decomposers in a wetland food chain model
• explain (using scientific ideas) one or more ways rubbish changes conditions in a wetland ecosystem
• propose an action to address rubbish and predict likely effects on living things
• use evidence from a short research task to support their explanation

Curriculum links

• Science — AC9S4U01: roles and interactions of consumers, producers and decomposers; food chains represent feeding relationships
• Science — AC9S4H02: consider how scientific explanations help solve problems (e.g. waste impacts on ecosystems)
• HASS — AC9HS4S06: propose actions/responses to a challenge and consider possible effects of those actions
• HASS/Science integration through investigation and explanation of ecosystem impacts and responses

Lesson structure (45 minutes)

1. 0–5 min · Hook (Wetland snapshot). Teacher shows an image set of a wetland with visible rubbish (e.g. plastic, wrappers, netting). Students do a quick think-pair-share: “What could this rubbish do to the habitat?”

2. 5–13 min · Build understanding (Ecosystem roles). Teacher introduces a simple wetland example (e.g. algae/plants → small animals/invertebrates → birds/fish; decomposers in mud). Students complete a teacher-led 3-column organiser: producers, consumers, decomposers, using examples from the wetland snapshot.

3. 13–22 min · Mini research task (How rubbish causes change). Teacher provides a short printed research sheet with 3–4 prompts about impacts (for example: entanglement risk, blocked waterways, reduced light for plants, toxins or contamination affecting food for animals). Students work in pairs to highlight one impact on:

• living things directly
• the habitat conditions (water, plants, mud)
• the food chain link (who is affected and how it could spread)

4. 22–33 min · Apply science: “Food chain impact” reasoning. Teacher models one example using sentence frames, then students complete their own:

• “If rubbish gets into the wetland, then ___ may happen to ___.”
• “This affects the food chain because ___ depend on ___.” Students draw a simple food chain and write arrows showing where the impact enters and how it could affect consumers and decomposers.

5. 33–41 min · Action planning (Predict effects). Teacher sets a challenge: “Our local wetland has increasing rubbish. What action could we take that is realistic for a school group?” Students choose one action from a shortlist or suggest their own (e.g. class “litter audit”, bin labelling and placement advice, wetland education poster, a supervised clean-up plan, composting and reduced single-use packaging). Students write:

• the action
• who it helps
• the likely effects on habitat and living things (one “likely benefit” and one “possible limitation/side effect”)

6. 41–45 min · Exit ticket (Show thinking). Students complete a short exit ticket: “One rubbish impact on a wetland is ___, and it could affect the ecosystem by ___.”

Resources

• Printed wetland image cards (with rubbish visible)
• Ecosystem role organiser (producers/consumers/decomposers)
• Short research sheet (3–4 impact prompts) in student reading level
• Sentence frames for explaining cause and effect in food chains
• Mini whiteboards or scrap paper for quick reasoning
• Coloured pencils for drawing food chains
• Action planning prompt sheet
• Exit ticket slips

Assessment

• Observe pair research notes for correct identification of ecosystem impacts and affected links
• Check food chain impact diagrams for accurate producer/consumer/decomposer roles and cause-effect arrows
• Exit ticket to confirm students can explain a rubbish impact and predict an effect using scientific reasoning

Differentiation

• Support: Provide word banks (wetland, habitat, decomposer, entangle, contaminate, food chain) and sentence starters for cause-and-effect explanations
• Support: Offer a partially completed food chain diagram for students who need scaffolding
• Extension: Students add a second impact and compare which impact could be most harmful and why (using evidence from the research sheet)
• EAL/SEN: Allow responses with diagrams plus 1–2 sentences; read research prompts aloud and highlight key terms
• Classroom roles: Assign partner roles (reader/highlighter, diagram writer, presenter) to support cooperation and participation