You will learn
- Define photosynthesis.
- Name the inputs and outputs.
- Identify chlorophyll.
- Explain why plants are producers.
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
Words to know
making food from light, water and carbon dioxide
the green substance that absorbs light
a sugar made by plants
a living thing that makes its own food
1. Discover: The green kitchen
Teacher Kojo says, “A leaf is a tiny kitchen. The Sun is the cooker, water comes from the roots, carbon dioxide comes from the air, and the food is sugar. The kitchen also releases oxygen.”
Think: Why do we need plants?
2. Understand: Photosynthesis
Idea 1: Inputs and outputs
Photosynthesis: carbon dioxide + water, using light energy, makes glucose and oxygen.
Idea 2: Chlorophyll
Chlorophyll in leaf cells absorbs light and makes leaves green. It captures the energy for photosynthesis.
Idea 3: Producers
Because plants make their own food, they are producers. Almost all other living things depend on them directly or indirectly.
3. Worked examples
Example 1 (I show you): List
Inputs.
- Light.
- Water.
- CO2.
Answer: Light, water, carbon dioxide.
Example 2 (We do it together): List
Outputs.
- Sugar.
- Oxygen.
- Food.
Answer: Glucose and oxygen.
Example 3 (You try): Explain
Producer.
Show the steps and answer
- Makes food.
- Own food.
- Base.
Answer: Plants make their own food.
Did you know?
Plants and algae produce about half the oxygen in the air we breathe, along with ocean plankton.
Why this matters
Photosynthesis feeds almost all life and gives us oxygen.
4. Explore: Leaf test
Compare a leaf kept in light and a leaf covered with foil for several days and observe colour and health.
- Choose a leaf.
- Cover one with foil.
- Leave for days.
- Uncover and compare.
Think about it: what did you notice?
What did you notice? The covered leaf was paler.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- ___ makes food from light, water and carbon dioxide.
- ___ is the green substance.
- ___ is a sugar.
- A ___ makes its own food.
Guided practice
Question 1. What is photosynthesis?
Food making.
Question 2. What is chlorophyll?
Green substance.
Question 3. What is glucose?
Sugar.
Independent practice
Level 1: Start
- What is photosynthesis?
- What is chlorophyll?
- What is glucose?
- What is a producer?
- What gas is made?
Level 2: Grow
- Why light?
- Why green?
- Why producers?
Level 3: Stretch
- Run the leaf test.
- Draw the equation.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain what happens in a leaf in sunshine.
Show a sample answer
Use inputs and outputs.
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 make food.
Fix: They use it.
8. Lesson summary and revision card
- I can define photosynthesis.
- I can name the inputs and outputs.
- I can identify chlorophyll.
- I can explain why plants are producers.
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
- Leaves absorb light using chlorophyll.
- Water and carbon dioxide are inputs.
- Glucose and oxygen are outputs.
- Plants are producers.
11. Next lesson
Next lesson: Sunlight and plant growth. 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 photosynthesis. [2 marks]
- Name inputs and outputs. [4 marks]
- Explain why plants are producers. [2 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- Plants [1]; make food from light, water, CO2 [1]
- 1 each
- Make own food [1]; base of food chains [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 photosynthesis?
- What is chlorophyll?
- What is glucose?
- What is a producer?
- What gas is made?
- Why light?
- Why green?
- Why producers?
- Run the leaf test.
- Draw the equation.
Homework
Find green leaves at home and say what they need.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is photosynthesis? | Food making. | 1 |
| 2. What is chlorophyll? | Green substance. | 1 |
| 3. What is glucose? | Sugar. | 1 |
| 4. What is a producer? | Maker. | 1 |
| 5. What gas is made? | Oxygen. | 1 |
| 6. Why light? | Energy. | 1 |
| 7. Why green? | Chlorophyll. | 1 |
| 8. Why producers? | Food base. | 1 |
| 9. Run the leaf test. | Table. | 1 |
| 10. Draw the equation. | Diagram. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Food making.; 2 Green substance.; 3 Sugar.; 4 Maker.; 5 Oxygen.. Level 2: 1 Energy.; 2 Chlorophyll.; 3 Food base.. Level 3: 1 Table.; 2 Diagram.; 3 Sentence..
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 photosynthesis | 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 the inputs and outputs | 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 Identify chlorophyll | 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 why plants are producers | 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: “Plants eat soil.” They make food.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain photosynthesis.
- 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 how plants make food. You do not need to be an expert to help.
- Look at plants in sunlight.
- Ask “What is it making?”
- No staring at the Sun.
- 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 photosynthesis; name the inputs and outputs; identify chlorophyll; explain why plants are producers.
Prerequisite knowledge. Grade 4 ideas: parts of a plant, what plants need, life cycles and simple food chains.
Materials. Leaf, foil, tape. 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 plant.
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). Hold a leaf up and ask, “What is it making?”
Explanation (10 min). Teach photosynthesis.
Guided activity (10 min). Learners test.
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 goes in? What comes out?
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. “Plants eat soil.” They make food.
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 photosynthesis. 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 5 Unit 3, topic 3; Next Generation Science Standards, matter and energy in organisms; Cambridge Primary Science Stage 5, biology: plants; IB Primary Years Programme, sharing the planet. These sources informed the lesson.