1. Name _______________________________ Date ____________________ Per. _____
Observing Cells Lab
Instructions: Create a lab report beginning on page 70 of your INB. The title of this lab is
Observing Cells Lab.
Introduction
After reading through the lab procedures in parts A and B, write a thorough introduction
explaining the purpose of this lab. Also use your knowledge about plant and animal cells
to add details to the introduction. Your introduction should be at least 7 sentences.
Materials:
Onion
Iodine stain
Slide and cover slip
Dropper
Toothpick
Microscope
Part A) ONION CELL LAB
Method:
1. Obtain a thin slice of onion from the teacher.
2. Put a drop of iodine stain on a slide.
- Be careful, stains can ruin clothing and other materials.
3. Place onion slice in iodine stain on the slide. The slice should not be wrinkled or
folded.
4. Put a cover slip over the stain.
5. Observe under the microscope under low, medium and high powers.
6. Draw your observations on your paper for low, medium, and high powers.
a. Label the cell membrane, nucleus, cytoplasm, and any other organelles you
observe (i.e. vacuoles).
7. Place your used materials in the designated area.
Part B) CHEEK CELL LAB
Method:
1. Obtain a clean slide and cover slip.
2. Put a drop of iodine stain on a slide.
- Be careful, stains can ruin clothing and other materials.
3. Gently rub the end of a toothpick on the inside of your mouth along the cheek.
- Be careful! Do not gouge out your cheek.
4. Stir the toothpick in the iodine stain.
5. Immediately, throw the toothpick away.
6. Put a cover slip over the stain.
7. Observe under the microscope under low, medium and high powers.
8. Draw your observations on your paper for low, medium, and high powers.
a. Label the cell membrane, nucleus, cytoplasm, and any other organelles you

2. Name _______________________________ Date ____________________ Per. _____
Observing Cells Lab
observe (i.e. vacuoles).
9. Place your used materials in the designated area.
Data Table
Create an appropriate data table under the procedures for parts A and B.
Analysis and Conclusion
Save room to write a conclusion that describes what you did in the lab and what you
discovered.