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Plants & photosynthesis

Grade 4 · Science · Free lesson

Hi there! I am Studyfin, your science buddy. Today, we will learn how to ask great questions about how plants make their own food!

Plants are amazing. They do not eat food like we do. Instead, they use sunlight, water, and air to make their own food. This cool process is called photosynthesis.

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To study plants, we need to ask good questions. A good question helps us design an experiment. We can ask: 'Do plants grow taller when they get more light?' This gives us a clear plan to test.

Does light help it grow?

Sometimes our questions are too broad, like 'How do plants live?' We can clarify them to make them better. We can change it to: 'Does a plant need soil to make food?' This lets us test one specific thing at a time.

Just Water?With Soil?
✏️ Worked example

Let us practice changing a big, blurry question into a sharp, testable science question about plants.

  1. Start with a big question: 'Why do leaves look happy in the sun?'
  2. Identify the main parts. The parts are leaves, sunlight, and how the plant looks.
  3. Think about what we can actually measure. We cannot easily measure 'happy.' But we can measure the leaf color or leaf size.
  4. Rewrite the question using measurable words: 'Do green leaves turn yellow if they are kept in the dark?'
  5. Check your new question. It is clear, it is specific, and we can test it with an experiment!
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