| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Biology |
| Lesson Topic: State that photosynthesis is the process by which plants manufacture carbohydrates from raw materials using energy from light. |
Learning Objective/s:
- Describe where photosynthesis occurs within plant cells.
- Explain the raw materials, energy source, and products of photosynthesis.
- Illustrate the overall chemical equation and identify the role of chlorophyll.
- Analyze how light intensity, CO₂ concentration, temperature, and water affect the rate of photosynthesis.
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Materials Needed:
- Projector or interactive whiteboard
- PowerPoint slides with leaf diagram
- Printed worksheet with equation and table
- Fresh green leaves (e.g., spinach) for observation
- LED light source or lamp
- Simple lab set‑up (beakers, water, CO₂ source)
- Markers and chart paper
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Introduction:
Begin with a quick video clip showing a leaf “breathing” in sunlight to capture interest. Ask students what they already know about how plants obtain food and energy. Explain that today they will be able to state the definition of photosynthesis and identify its key components. Success will be measured by their ability to explain the process and predict factors that influence its rate.
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Lesson Structure:
- Do‑Now (5'): Students write a one‑sentence definition of photosynthesis from prior knowledge; teacher collects responses.
- Mini‑lecture (10'): Slides covering chloroplast location, raw materials, overall equation, and chlorophyll light absorption.
- Interactive diagram activity (12'): Groups label a leaf cross‑section diagram with CO₂, H₂O, light, glucose, and O₂.
- Demonstration (8'): Show a leaf under LED light versus darkness and discuss observed oxygen production.
- Factors discussion (10'): Guided inquiry on light intensity, CO₂, temperature, and water; students record predictions on a chart.
- Check for understanding (5'): Quick quiz (exit ticket) with 2‑3 short questions.
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Conclusion:
Summarise that photosynthesis converts CO₂ and water into glucose and oxygen using light energy in chloroplasts. Remind students of the four main factors that can speed up or slow down the reaction. For the exit ticket, they write one factor they think is most important and why. Homework: complete a worksheet comparing photosynthesis and cellular respiration.
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