You will learn
- Define ecosystem.
- Name living and non-living parts.
- Compare large and small ecosystems.
- Explain how parts depend on each other.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- An ecosystem has living and non-living parts.
- Living things interact.
- Ecosystems can be tiny or huge.
- Changing one part can change others.
Words to know
living things and their surroundings acting together
all the living things in one place
everything around a living thing
to affect one another
1. Discover: The school pond
Akosua studies the school pond. She finds frogs, water lilies, insects, water, mud and sunlight. “The lilies make food from sunlight,” she says. “Insects eat the lilies, and frogs eat the insects.” Her teacher smiles. “You have described an ecosystem.”
Think: Which parts of the pond are non-living?
2. Understand: Ecosystems
Idea 1: Parts of an ecosystem
An ecosystem includes all living things (plants, animals, fungi) and non-living things (water, soil, air, sunlight, temperature) in a place.
Idea 2: Community and environment
All the living things in a place form a community. The community and its environment interact: plants use sunlight and water, animals eat plants.
Idea 3: Big and small
A rotting log is a small ecosystem. A pond, a forest, a coral reef or a desert is larger. The ocean is the biggest. Each has its own plants and animals.
3. Worked examples
Example 1 (I show you): Sort
Frog, water, lily, sunlight.
- Living: frog, lily.
- Non-living: water, sunlight.
- Check.
Answer: Frogs and lilies are living; water and sunlight are not.
Example 2 (We do it together): Size
Rotting log vs forest.
- Both ecosystems.
- Log is small.
- Forest is large.
Answer: Ecosystems come in many sizes.
Example 3 (You try): Interact
Insects eat lily leaves.
Show the steps and answer
- Link them.
- Who eats whom?
- Draw arrows.
Answer: Insects get food from the lily.
Did you know?
A single handful of healthy forest soil can contain more living things than there are people on Earth.
Why this matters
Understanding ecosystems helps us protect the places where living things survive.
4. Explore: Ecosystem survey
Explore a small outdoor patch and record living and non-living parts.
- Mark a one-metre square.
- List living things you see.
- List non-living things.
- Draw arrows showing interactions.
Think about it: what did you notice?
What did you notice? Even a small patch had many linked parts.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- An ___ is living things and their surroundings.
- All living things in a place form a ___.
- Water and sunlight are ___ parts.
- Living things ___ with each other.
Guided practice
Question 1. What is an ecosystem?
Living and non-living parts.
Question 2. What is a community?
Living things together.
Question 3. Name a non-living part.
Water.
Independent practice
Level 1: Start
- What is an ecosystem?
- What is a community?
- Name a non-living part.
- Name a small ecosystem.
- Name a large one.
Level 2: Grow
- Why do parts depend on each other?
- Why is sunlight important?
- Why are ecosystems different sizes?
Level 3: Stretch
- Sort living and non-living.
- Draw a pond ecosystem.
- Describe two interactions.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Describe your local ecosystem.
Show a sample answer
Name living and non-living parts.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: They include plants and non-living parts.
Fix: Some are tiny.
8. Lesson summary and revision card
- I can define ecosystem.
- I can name living and non-living parts.
- I can compare large and small ecosystems.
- I can explain how parts depend on each other.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- An ecosystem has living and non-living parts.
- Living things interact.
- Ecosystems can be tiny or huge.
- Changing one part can change others.
11. Next lesson
Next lesson: Habitat components. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define ecosystem. [2 marks]
- Name two living and two non-living parts. [4 marks]
- Describe one interaction. [2 marks]
- Safety rule? [2 marks]
Total: 10 marks.
Marking guide and model answers
- Living things [1]; and surroundings interacting [1]
- 1 each
- Two parts [1]; link [1]
- Any rule [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is an ecosystem?
- What is a community?
- Name a non-living part.
- Name a small ecosystem.
- Name a large one.
- Why do parts depend on each other?
- Why is sunlight important?
- Why are ecosystems different sizes?
- Sort living and non-living.
- Draw a pond ecosystem.
Homework
Draw a small ecosystem near your home and label five parts.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is an ecosystem? | Living and non-living parts. | 1 |
| 2. What is a community? | Living things together. | 1 |
| 3. Name a non-living part. | Water. | 1 |
| 4. Name a small ecosystem. | Log. | 1 |
| 5. Name a large one. | Ocean. | 1 |
| 6. Why do parts depend on each other? | Food and shelter. | 1 |
| 7. Why is sunlight important? | Energy. | 1 |
| 8. Why are ecosystems different sizes? | Places differ. | 1 |
| 9. Sort living and non-living. | Two lists. | 1 |
| 10. Draw a pond ecosystem. | Diagram. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Living and non-living parts.; 2 Living things together.; 3 Water.; 4 Log.; 5 Ocean.. Level 2: 1 Food and shelter.; 2 Energy.; 3 Places differ.. Level 3: 1 Two lists.; 2 Diagram.; 3 Sentences..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Define ecosystem | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Name living and non-living parts | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Compare large and small ecosystems | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Explain how parts depend on each other | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Ecosystems only have animals.” They include plants and non-living parts.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain what an ecosystem is.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child studies ecosystems. You do not need to be an expert to help.
- Look at a garden together.
- Ask “What is living here?”
- Do not pick plants.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: define ecosystem; name living and non-living parts; compare large and small ecosystems; explain how parts depend on each other.
Prerequisite knowledge. Grade 3 ecosystem ideas: living and non-living parts, producers, consumers, simple food chains and habitats.
Materials. Notebooks, hand lenses, string. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Choose a safe outdoor patch.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Show a pond picture and ask, “What lives and what does not?”
Explanation (10 min). Teach ecosystems.
Guided activity (10 min). Learners survey a patch.
Independent activity (10 min). Learners share.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What lives here? What is non-living? How are they linked?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Ecosystems only have animals.” They include plants and non-living parts.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Explain what an ecosystem is. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 4 Unit 2, topic 1; Next Generation Science Standards, ecosystems: interactions, energy and dynamics; Cambridge Primary Science Stage 4, biology and environment; IB Primary Years Programme, sharing the planet. These sources informed the lesson.