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This post contains affiliate links. Thanks for your support! Observing Onion Cells under a Microscope is a great introduction to the microscope. Make sure to subscribe for free lab observation sheets and visit How to Make Amazing Observations with a Microscope for more microscope lessons. If you are studying life science or biology this year, one of the easiest labs in cell biology is observing onion cells under a microscope. I thought it would be helpful to share how I help students to see an example of a plant cell. Today’s objective: Observing Onion Cells under a Microscope The goals for this lesson are to:
Materials Needed for Observing Onion CellsYou will need to purchase some science materials for this lab exercise. The nice thing about purchasing the appropriate supplies is that you’ll have them on hand the next time you want to use your microscope. I like to buy supplies from Amazon and Home Science Tools depending on the availability and price.
Staining Onion CellsSince onion peels are translucent, you’ll need to stain the onion cells before you observe them under the microscope. There are different types of stains depending on what type of cell you are going to look at.
The Microscopic Life Kit from Home Science Tools contains both Eosin Y and Methylene Blue for staining many types of cells. Preparing the Onion Cells for the Microscope SlideIodine is a great choice because it’s a household product, but more sophisticated stains will allow you to see more structures in the onion cell.The procedure is fairly simple. You just need to be careful as you work to get a good peel of an onion. You want a single layer of cells or you won’t see much under the microscope. In order to see the cells well, the light needs to pass through easily.
Observing & Recording Your ObservationsTo prepare for recording your observations, have your students create a data sheet. Having your students make their own data sheet helps them to organize information. I usually give the following directions.
In this case, we want to record as much as we can about what we see. For example:
Teacher Hint: You will not be able to see the individual organelles with a standard light microscope. The most noticeable item will be the cell wall. In general, you will see a group of neat rectangles with an outer layer (the cell wall). The higher the magnification, the more defined the cell wall will become and the field of view will be smaller so you will see less rectangles. Free Microscope Observations Lab PrintableQuality Microscopes for Your HomeschoolAll of our microscopes come from Home Science Tools. You can find a microscope there for all your needs. We have a digital scope, a stereo dissecting scope, and we have the compound light microscope featured in this lab exercise. More Microscope LessonsThe Beginner’s Guide to Using the Microscope– This post contains a full video tutorial on using a light microscope. 10 Reasons a Digital Microscope is an Amazing Science Tool– an updated post on choosing and using a digital microscope in your homeschool. They are a pleasing alternative to expensive microscopes. 3 Easy Steps to Observing Pond Life under the Microscope– How to collect The Beginner’s Guide to Microscopic Life in a Pond– Need help identifying what you observed from your pond sample? Or do you need to know what to look for at all? This is the place! How to Capture & View Snowflakes under a Microscope– The title says it all, but this is a fun and addicting activity. Once you see one, you’ll be after more! The Snake Project– A year long 8th grade life science project during which Rebecca (now in her first year of college at an Ivy League school) studied biology through the lens of snakes. It was a fabulous year of in depth study which she can now draw on as she studies high school biology. Entomology The Science of Insects– We have two entomologists in our house who collect and pin specimens regularly. This is a series of posts which shares equipment, collection, pinning, and displaying. It’s my hope that you will be able to take this science lesson and apply it in your homeschool easily. |