You will learn
- State the cell theory.
- Link cells to life processes.
- Explain cell division simply.
- Compare single and many cells.
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
- Cells are the units of life.
- New cells come from existing cells.
- Cells carry out life processes.
- Organisms can be one cell or many.
Words to know
the idea that all living things are made of cells
the activities that all living things carry out
a cell splitting to make new cells
a living thing
1. Discover: The healing cut
Dela scrapes her knee. Within days the skin heals. “Your skin cells divided to fill the gap,” says the nurse. “New cells come from old ones.”
Think: Where do the new cells come from?
2. Understand: Cell theory
Idea 1: The theory
The cell theory says: all living things are made of cells; the cell is the basic unit of life; new cells come from existing cells.
Idea 2: Processes
Cells carry out the life processes: movement, respiration, sensitivity, growth, reproduction, excretion and nutrition (MRS GREN).
Idea 3: Division
In cell division, one cell makes copies of its parts and splits in two. This lets organisms grow and repair injuries.
3. Worked examples
Example 1 (I show you): State
Theory.
- Made of cells.
- Basic unit.
- From cells.
Answer: Three ideas.
Example 2 (We do it together): List
Processes.
- Move.
- Grow.
- Reproduce.
Answer: MRS GREN.
Example 3 (You try): Explain
Healing.
Show the steps and answer
- Divide.
- Fill gap.
- Repair.
Answer: Cell division repairs.
Did you know?
Rudolf Virchow wrote in 1855 that every cell comes from another cell.
Why this matters
Cell theory is the foundation of all biology and medicine.
4. Explore: MRS GREN cards
Match life-process cards to examples of what a single yeast cell or a student can do, then discuss which processes cells carry out alone.
- Read cards.
- Match examples.
- Mark cell processes.
- Discuss.
Think about it: what did you notice?
What did you notice? A single cell can do them all.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- The ___ theory says all living things are made of cells.
- ___ processes are activities all living things do.
- Cell ___ is a cell splitting to make new cells.
- An ___ is a living thing.
Guided practice
Question 1. What is cell theory?
All life is cells.
Question 2. What are life processes?
Activities.
Question 3. What is cell division?
Splitting.
Independent practice
Level 1: Start
- What is cell theory?
- What are life processes?
- What is cell division?
- Name one process.
- What is an organism?
Level 2: Grow
- Why divide?
- Why cell theory?
- Why processes?
Level 3: Stretch
- Match cards.
- Explain.
- Review.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain how cell division helps a cut heal.
Show a sample answer
Use the theory.
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: From cells.
Fix: All.
8. Lesson summary and revision card
- I can state the cell theory.
- I can link cells to life processes.
- I can explain cell division simply.
- I can compare single and many cells.
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
- Cells are the units of life.
- New cells come from existing cells.
- Cells carry out life processes.
- Organisms can be one cell or many.
11. Next lesson
Next lesson: Plant cells. 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 cell theory and organism. [2 marks]
- List four life processes. [2 marks]
- Explain how cell division heals a cut. [4 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Two correct per mark
- Divide [1]; new cells [1]; fill gap [1]; repair [1]
- Any [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 cell theory?
- What are life processes?
- What is cell division?
- Name one process.
- What is an organism?
- Why divide?
- Why cell theory?
- Why processes?
- Match cards.
- Explain.
Homework
List the seven life processes with an example for each.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is cell theory? | All life is cells. | 1 |
| 2. What are life processes? | Activities. | 1 |
| 3. What is cell division? | Splitting. | 1 |
| 4. Name one process. | Growth. | 1 |
| 5. What is an organism? | Living thing. | 1 |
| 6. Why divide? | Grow and repair. | 1 |
| 7. Why cell theory? | Foundation. | 1 |
| 8. Why processes? | Keep alive. | 1 |
| 9. Match cards. | Table. | 1 |
| 10. Explain. | Sentence. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 All life is cells.; 2 Activities.; 3 Splitting.; 4 Growth.; 5 Living thing.. Level 2: 1 Grow and repair.; 2 Foundation.; 3 Keep alive.. Level 3: 1 Table.; 2 Sentence.; 3 Notes..
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 State the cell theory | 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 cells to life processes | 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 cell division simply | 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 Compare single and many cells | 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: “Cells appear from nowhere.” From cells.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: State the cell theory.
- 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 the cell theory. You do not need to be an expert to help.
- Notice healing.
- Ask “Where do new cells come from?”
- Be gentle with cuts.
- 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: state the cell theory; link cells to life processes; explain cell division simply; compare single and many cells.
Prerequisite knowledge. Grade 5 ideas: living things, plant and animal parts and using a hand lens.
Materials. Process cards. 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. Print 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). Ask, “How do you know a yeast cell is alive?”
Explanation (10 min). Teach cell theory.
Guided activity (10 min). Learners match.
Independent activity (10 min). Learners discuss.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Which process? How do cells do it?
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. “Cells appear from nowhere.” From cells.
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. State the cell theory. 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 6 Unit 3, topic 2; Next Generation Science Standards, structure and function; Cambridge Lower Secondary Science, cells and organisation; IB Primary Years Programme, who we are. These sources informed the lesson.