Plants Worksheet - KS3 - Intermediate
Plants worksheet for Key Stage 3 / Year 7-9 (Ages 11-14). Intermediate level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.
Exploring Plant Science: Photosynthesis and Beyond
Key Stage 3 / Year 7-9 (Ages 11-14) - Intermediate
Instructions: This worksheet will guide you through various aspects of plant science, including photosynthesis, plant reproduction, and the role of plants in ecosystems. Engage with data analysis, diagram labelling, and word problems to deepen your understanding.
Photosynthesis Equation Practice
Complete the word and symbol equations for photosynthesis. Remember to balance the equations correctly and identify the reactants and products.
1. Word equation: Carbon dioxide + water → glucose + oxygen
2. Symbol equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Factors Affecting Photosynthesis
Analyse the table below showing the rate of photosynthesis under different conditions. Answer the questions based on the data provided.
| Light Intensity (lux) | CO₂ Concentration (%) | Temperature (°C) | Rate of Photosynthesis (units) |
| 100 | 0.03 | 20 | 50 |
| 200 | 0.04 | 25 | 80 |
| 300 | 0.05 | 30 | 120 |
1. Which condition resulted in the highest rate of photosynthesis?
2. How does increasing CO₂ concentration affect the rate of photosynthesis?
3. What is the relationship between light intensity and photosynthesis rate?
Diagram Labelling: Plant Cell
Label the parts of the plant cell diagram. Use the word bank provided to fill in the blanks.
Word Bank
Plant Reproduction Processes
Match each process of plant reproduction with its correct description. Draw lines to connect the correct pairs.
Draw a line to match each one
Word Problem: Ecosystem Role
Solve the word problem regarding the role of plants in ecosystems. Show your calculations clearly.
A forest ecosystem has 500 trees, each absorbing 22 kg of CO₂ annually. Calculate the total amount of CO₂ absorbed by the forest in a year.
Extended Writing: Importance of Plants
Write a detailed essay discussing the importance of plants in maintaining ecological balance. Include examples such as oxygen production, food chains, and habitat provision. [10 marks]
Data Analysis: Plant Growth Experiment
Examine the data from a plant growth experiment under different conditions. Answer the questions that follow.
| Condition | Height Day 1 (cm) | Height Day 7 (cm) | Height Day 14 (cm) |
| Control | 5 | 10 | 15 |
| Fertiliser | 5 | 12 | 20 |
1. Which condition showed the most growth over 14 days?
2. How did the lack of water affect plant growth?
3. Calculate the average growth rate for the fertiliser condition.
Fill in the Blanks: Photosynthesis Vocabulary
Use the words from the word bank to complete the sentences about photosynthesis.
Word bank: chlorophyll, glucose, oxygen, sunlight
1. Plants use ___ to capture light energy.
2. The main product of photosynthesis is ___.
3. ___ is released as a byproduct during photosynthesis.
Activity 1: glucose + oxygen ; C₆H₁₂O₆ + 6O₂
Activity 2: 400 lux, 0.06% CO₂, 35°C ; Increases rate ; Directly proportional
Activity 3: Cell Wall, Cell Membrane, Nucleus, Vacuole, Chloroplast, Mitochondria
Activity 4: Pollination ; Germination ; Seed Dispersal ; Photosynthesis
Activity 5: 11,000 kg CO₂
Activity 6: Essay will vary
Activity 7: Fertiliser ; Decreased growth ; 1.07 cm/day
Activity 8: chlorophyll ; glucose ; oxygen
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