Title : Photosynthesis - Class 8 Science Subject - Science Grade - 8 Duration - 40 minutes

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• Science
• Secondary Education
• Age 13

Title: Photosynthesis

Subject - Science

Grade - 8

Duration - 40 minutes

Title: Photosynthesis – How Plants Make Food

By the end of this lesson, you will be able to:

1. Define photosynthesis.

2. Write the word equation of photosynthesis.

3. Identify raw materials and products.

4. Explain why photosynthesis is important for life

Question to students :

How do plants eat if they don’t have a mouth like us?

Explanation:

Plants make their own food through a process called photosynthesis.

“Photo” means light, and “Synthesis” means to put together.

Plants use sunlight to make food from carbon dioxide and water!

Photosynthesis is the process by which green plants use sunlight to make food from carbon dioxide and water.

Word Equation:

Carbon dioxide + Water → Glucose + Oxygen

(in presence of sunlight and chlorophyll)

Key Points:

Occurs in the leaves (chloroplasts).

Sunlight provides energy.

Chlorophyll traps sunlight.

Oxygen is released into the air.

Which plant performs photosynthesis?

1

Sunlight Plant

2

Dark Plant

Observation Activity

Instruction for students:

Look at these two pictures:

1. A plant kept in sunlight

2. A plant kept in darkness

Ask:

Which plant looks healthier?

Why do you think one plant turned yellow or weak?

Conclusion:

Plants need sunlight to make their own food — that process is photosynthesis!

Evaluation

Add the following questions:

1. What is photosynthesis?

2. Name the raw materials used.

3. What gas is released during photosynthesis?

4. Write the word equation.

5. Why is it important for life?

Summary

Photosynthesis is the process by which green plants make their own food using sunlight, carbon dioxide (CO₂) from the air, and water (H₂O) from the soil.

With the help of a green pigment called chlorophyll, plants convert these raw materials into glucose (food) and release oxygen (O₂) into the air.

This process is very important because:

It provides food and energy for all living things.

It releases oxygen, which is essential for breathing.

It helps maintain the balance of oxygen and carbon dioxide in the atmosphere.

In short, photosynthesis supports all life on Earth — it is nature’s way of making food and air for every living being.

Homework

Task:

1. Draw and label a neat diagram of photosynthesis and write the word equation below it.