1. What should you do to avoid trapping air bubbles when placing the coverslip over the onion peel?

2. What similarities are observed between the structure of onion peel cells under the microscope and a wall made of bricks?

3. What are the main parts of an onion cell visible under the microscope as labeled in the diagram?

4. Why is it important to use blotting paper around the edges of the coverslip?

5. What conclusion can you draw about plant cells after observing the onion peel under a microscope?

6. What is the purpose of adding methylene blue stain when preparing a slide of cheek cells?

7. Which three main parts are present in all cells?

8. What is the function of the cell membrane in a cell?

9. Which structure is present in onion peel cells but not in human cheek cells?

10. Why is cytoplasm important for the cell?