Cells and Microscopes
This lesson introduces Year 7 students to the fundamental unit of life: the cell. Students will learn to distinguish between plant and animal cells, understand the function of key organelles, and learn the practical skills required to use a light microscope to observe microscopic structures.
Learning objectives
- Identify the main structures (organelles) in plant and animal cells and describe their functions.
- Identify the parts of a light microscope and explain their uses.
- Calculate the total magnification of a microscope using the eyepiece and objective lens powers.
- Compare the similarities and differences between plant and animal cells.
Lesson plan (60 minutes)
Starter · 5 min
Do Now: Label a simple diagram of a house using 'building blocks' as an analogy for cells.
Introduction · 15 min
Teacher-led explainer on cell organelles and microscope parts using the provided script.
Demonstration · 10 min
Demonstration: How to set up a microscope slide (onion cell) safely.
Main Activity · 20 min
Differentiated Worksheet Activity: Students work through Support, Core, or Stretch tasks.
Review · 10 min
Plenary: 8-question Multiple Choice Quiz to check for understanding.
Key vocabulary
- Nucleus
- The control centre of the cell containing genetic material (DNA).
- Cytoplasm
- The jelly-like substance where chemical reactions happen.
- Cell Membrane
- The outer layer of a cell that controls which substances enter and leave.
- Cell Wall
- A tough outer layer made of cellulose that supports plant cells.
- Chloroplast
- The part of a plant cell where photosynthesis happens.
Core worksheet (first questions)
- Describe three differences between an animal cell and a plant cell.
- If the eyepiece lens is 10x and the objective lens is 40x, what is the total magnification? Show your working.
- When preparing a slide, why must the specimen (e.g., onion skin) be very thin?
- Which organelle provides the cell with energy? Name the process that happens there.
Quiz (sample)
1. What is the function of the nucleus?
- A. The site of respiration
- B. The control centre containing DNA
- C. A storage space for sap
- D. The outer layer of the cell
2. Which organelle is found in plant cells but NOT animal cells?
- A. Nucleus
- B. Cytoplasm
- C. Chloroplast
- D. Cell membrane
3. Where does respiration take place in the cell?
- A. Mitochondria
- B. Ribosomes
- C. Vacuole
- D. Cell wall
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Support and Stretch worksheets, every answer and model answer, the teaching explainer and common misconceptions, editable and ready to print as PDF or Word.
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