Unit 3 · Living Beings and Their Structure
The Cell: Building Block of Life
Science & Technology · Grade 7
Learning Objectives
🔬Say what a cell is and how we came to know about it
📐Explain why every cell is small, using surface and inside
🧩Name the parts of a cell and what each one does
🌿Tell a plant cell from an animal cell, and say why they differ
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For thousands of years people studied living things carefully and saw no cells at all. Careful looking was not enough. A tool was needed.
Presenter notes: Open by asking the class to look at their own hand and describe what it is made of. Answers will be skin, bone, blood. Keep pushing. What is skin made of? Eventually somebody says cells, usually because they have read ahead. Then ask the better question: how would anyone ever have found that out? Nobody can see a cell. Leave that hanging, because the next slide answers it and the answer is a date.