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✦ Class 8 · Science
Photosynthesis
Plants are actually making their own food while you're sitting in the sun—and they're using light to do it.
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What this lesson covers
Step by step, in this order.
- 1Start with a puzzle: plants don't eat. So where do they get their energy?
- 2Plants get energy from sunlight. They trap light and turn it into food. That process is photosynthesis.
- 3Three things go in: sunlight, water from the ground, and carbon dioxide from the air.
- 4Inside the leaf is a green pigment called chlorophyll. It catches the light energy.
- 5The plant uses that energy to combine water and carbon dioxide into glucose—that's sugar. It's the plant's food.
- 6There's a bonus: oxygen gets released into the air. That's the oxygen you breathe.
- 7In 1771, a scientist named Joseph Priestley did an experiment. He trapped a mouse in a jar with a plant. The mouse didn't die. Why? The plant was making oxygen.
- 8This is why forests are so important. Plants feed themselves and give us the air we need to live.
- 9So photosynthesis is how plants trap light, make food, and give us oxygen—all at the same time.
How it looks
A real board, not a video.
This board is from a different Science lesson — yours will look like this. She writes and draws while she explains, and stops to check you followed.
Doubts this lesson clears up
- Plants don't eat like you do. They make their own food from sunlight, water, and air using photosynthesis.
- Chlorophyll is the green color in leaves. It's special because it catches light energy really well—better than other colors.
- No. Without sunlight, photosynthesis can't happen. The plant can't make food and will eventually die.
- Oxygen is released during photosynthesis. Every breath you take has oxygen from plants. That's why they're vital.
- Glucose is a simple sugar. It's the plant's energy food. The plant uses it to grow and do everything alive things do.
- Photosynthesis only happens in light. At night, plants rest. But they stored energy during the day, so they can survive.
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