You will learn
- List the functions of bones.
- Link structure to function.
- Explain how bone marrow works.
- Describe calcium storage.
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
- Bones support and protect.
- They help us move.
- Marrow makes blood cells.
- Bones store calcium.
Words to know
the job something does
soft tissue inside bones that makes blood
a natural substance such as calcium
how something is built
1. Discover: The broken drumstick
Yaw’s cook snaps a chicken bone for soup. Inside it is soft and red. “That is marrow,” the cook says. “It makes blood in your body too.” Yaw is surprised. “Bones are not just sticks,” he says. “They are busy!”
Think: What job does marrow do?
2. Understand: Bone jobs
Idea 1: Support, protect, move
Bones form a strong structure for the body. Hard bones support, protect and give muscles something to pull.
Idea 2: Blood and minerals
Inside many bones is marrow, which makes red and white blood cells. Bones also store minerals such as calcium and release them when the body needs them.
Idea 3: Structure and function
Long bones are strong yet light because they are hollow with a spongy centre. The function of each bone matches its shape.
3. Worked examples
Example 1 (I show you): Function
Skull.
- Protects brain.
- Hard.
- Curved.
Answer: The skull protects.
Example 2 (We do it together): Function
Marrow.
- Inside bones.
- Makes blood.
- Red cells.
Answer: Marrow makes blood cells.
Example 3 (You try): Function
Calcium store.
Show the steps and answer
- Minerals.
- Strong bones.
- Released when needed.
Answer: Bones store calcium.
Did you know?
Your body makes about two million new red blood cells every second, most of them inside your bone marrow.
Why this matters
Knowing what bones do shows why we must keep them healthy.
4. Explore: Function sort
Sort cards into bone functions and give an example for each.
- Read the function cards.
- Match bone examples.
- Write a sentence each.
- Share with a partner.
Think about it: what did you notice?
What did you notice? Bones are more than a frame.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is the job something does.
- ___ is soft tissue that makes blood.
- Calcium is a ___.
- ___ is how something is built.
Guided practice
Question 1. What is marrow?
Makes blood.
Question 2. Name a mineral.
Calcium.
Question 3. What is structure?
How built.
Independent practice
Level 1: Start
- What is marrow?
- Name a mineral.
- What is structure?
- What is function?
- Name a bone job.
Level 2: Grow
- Why hollow bones?
- Why store calcium?
- Why make blood?
Level 3: Stretch
- List bone jobs.
- Match shape to job.
- Draw a long bone.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain two jobs of bones.
Show a sample answer
Examples.
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 do five jobs.
Fix: It makes blood.
8. Lesson summary and revision card
- I can list the functions of bones.
- I can link structure to function.
- I can explain how bone marrow works.
- I can describe calcium storage.
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
- Bones support and protect.
- They help us move.
- Marrow makes blood cells.
- Bones store calcium.
11. Next lesson
Next lesson: Joints. 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.
- List four functions of bones. [4 marks]
- Explain what marrow does. [2 marks]
- Link a bone shape to its job. [3 marks]
- Safety rule? [1 mark]
Total: 10 marks.
Marking guide and model answers
- Any four [1 each]
- Inside bones [1]; makes blood cells [1]
- Shape [1]; job [1]; link [1]
- Any [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 marrow?
- Name a mineral.
- What is structure?
- What is function?
- Name a bone job.
- Why hollow bones?
- Why store calcium?
- Why make blood?
- List bone jobs.
- Match shape to job.
Homework
Make a poster showing five jobs of bones.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is marrow? | Makes blood. | 1 |
| 2. Name a mineral. | Calcium. | 1 |
| 3. What is structure? | How built. | 1 |
| 4. What is function? | Job. | 1 |
| 5. Name a bone job. | Protect. | 1 |
| 6. Why hollow bones? | Light and strong. | 1 |
| 7. Why store calcium? | Keep strong. | 1 |
| 8. Why make blood? | Carry oxygen. | 1 |
| 9. List bone jobs. | List. | 1 |
| 10. Match shape to job. | Table. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Makes blood.; 2 Calcium.; 3 How built.; 4 Job.; 5 Protect.. Level 2: 1 Light and strong.; 2 Keep strong.; 3 Carry oxygen.. Level 3: 1 List.; 2 Table.; 3 Diagram..
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 List the functions of bones | 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 Link structure to function | 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 Explain how bone marrow works | 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 Describe calcium storage | 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: “Bones only hold us up.” They do five jobs.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain bone functions.
- 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 learns what bones do. You do not need to be an expert to help.
- Talk about strong bones.
- Ask “What does this bone do?”
- Use pictures.
- 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: list the functions of bones; link structure to function; explain how bone marrow works; describe calcium storage.
Prerequisite knowledge. Grade 3 body ideas: major organs, the heart and lungs, nutrition and healthy habits.
Materials. Paper, pencils. 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. Prepare job cards.
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 chicken bone picture and ask, “What is inside?”
Explanation (10 min). Teach bone jobs.
Guided activity (10 min). Learners sort.
Independent activity (10 min). Learners explain.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What job? What shape?
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. “Bones only hold us up.” They do five jobs.
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 bone functions. 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 3, topic 3; Next Generation Science Standards, structure, function and information processing; Cambridge Primary Science Stage 4, biology; IB Primary Years Programme, who we are. These sources informed the lesson.