Photosynthesis Worksheet — KS3 — Beginner
Photosynthesis worksheet for Key Stage 3 / Year 7-9 (Ages 11-14). Beginner level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.
Exploring Photosynthesis: Understanding the Basics
Key Stage 3 / Year 7-9 (Ages 11-14) - Beginner Level
Instructions: This worksheet is designed to introduce you to the fundamental concepts of photosynthesis. You will explore how plants convert light energy into chemical energy, and understand the importance of this process to life on Earth.
Photosynthesis Equation
Write the balanced chemical equation for photosynthesis. Ensure you include all reactants and products. Use the space provided to show your working.
Write the balanced equation for photosynthesis:
Key Components of Photosynthesis
Identify the main components necessary for photosynthesis. Write each component in the box provided.
1. What is the main source of energy for photosynthesis?
2. Name the gas taken in by plants during photosynthesis.
3. What is the primary pigment involved in photosynthesis?
The Process of Photosynthesis
Explain the process of photosynthesis in your own words. Include the role of chlorophyll and the importance of light.
Describe the process of photosynthesis:
Photosynthesis and Plant Cells
Label the parts of a plant cell involved in photosynthesis using the diagram below. Use the word bank to help you.
Word Bank
Photosynthesis Word Search
Find and circle the words related to photosynthesis in the word search. Cross off each word as you find it.
[WORD_LIST:PHOTOSYNTHESIS,CHLOROPHYLL,GLUCOSE,OXYGEN,CARBON DIOXIDE,WATER]
[ ] PHOTOSYNTHESIS [ ] CHLOROPHYLL [ ] GLUCOSE [ ] OXYGEN [ ] CARBON DIOXIDE [ ] WATER
Photosynthesis Data Analysis
Analyse the data in the table and answer the questions below. Consider how different factors affect the rate of photosynthesis.
| Light Intensity | Rate of Photosynthesis | Temperature |
| Low | 5 | 15°C |
| Medium | 10 | 20°C |
| High | 15 | 25°C |
1. Which light intensity results in the highest rate of photosynthesis?
2. What is the effect of temperature on the rate of photosynthesis?
Photosynthesis and the Environment
Discuss how photosynthesis impacts the environment. Consider its role in the carbon cycle and oxygen production.
Explain the environmental impact of photosynthesis:
True or False: Photosynthesis Facts
Read each statement about photosynthesis and decide if it is true or false. Write 'True' or 'False' in the box provided.
1. Photosynthesis occurs in the roots of plants.
2. Oxygen is a by-product of photosynthesis.
3. Chlorophyll is found in the mitochondria.
Activity 1: 6CO2 + 6H2O → C6H12O6 + 6O2
Activity 2: Sunlight ; Carbon Dioxide ; Chlorophyll
Activity 3: (Student's own description)
Activity 4: (Diagram labels)
Activity 5: (Words found in the word search)
Activity 6: High ; Temperature increases rate
Activity 7: (Student's own explanation)
Activity 8: False ; True ; False
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