Name ______________________________________ Date _________________
Plant and Animal Cells Microscope Lab
Objectives:
Students will discover that onions are made up of cells.
Students will observe onion cells under a microscope.
Students will discover that their skin is made up of cells.
Students will observe cheek cells under a microscope.
Materials:
microscope
two glass slides
iodine stain
methylene blue stain
two cover slips
an onion
a toothpick
Procedures:
Onion cells
1. Peel a translucent piece of tissue from the onion. (The smaller the piece the
better.) Translucent means that you can see light through the specimen, but it is
not transparent.
2. Place the piece of onion on a glass slide and add a drop of the iodine solution.
Cover the slide with a cover slip using your best wet-mount making techniques.
3. Observe the onion cell under both low and high power. Make a drawing of one
onion cell, labeling all of its parts as you observe them.
(At minimum, you should observe the nucleus, cell wall, and cytoplasm.)
Cheek cells
1. To view cheek cells, gently scrape the inside lining of your cheek with a
toothpick. DO NOT GOUGE THE INSIDE OF YOUR CHEEK! (We will observe
blood cells in a future lab!!)
2. Gently roll and rub the toothpick onto the top of a glass slide in an area that
will be visible through the microscope.
3. Add a drop of methylene blue (specific for animals) and cover with a cover slip.
4. Observe the cheek cells under both low and high power of your microscope.
Draw a diagram of one cheek cell and label the parts.
(You should observe the cell membrane, nucleus, and cytoplasm.)
