If you are looking for a bacteria lab for high school biology that gets students engaged right away, this microorganisms lab is a great way to bring microbiology into your classroom. Students swab surfaces around the school, grow bacteria on agar plates, and compare the results to see which areas have the most growth.
This is one of those labs that students talk about long after it is over. They are always curious to see which locations will grow the most bacteria, and the results often surprise them. It is a hands-on lab that helps students connect microorganisms and scientific observation of the world around them.
What is this bacteria lab?
In this lab, students investigate microorganisms in the school environment by choosing surfaces to test, swabbing those surfaces, and streaking the samples onto nutrient agar plates. After incubation, students observe colony growth, compare results, and decide which locations in the school had the greatest number of microorganisms.
This lab works especially well in a bacteria or microorganisms unit because it gives students a chance to collect real data and see visible evidence of microbial growth. It also creates a natural opportunity to discuss contamination, environmental conditions, bacterial growth, and how scientific results can sometimes challenge our assumptions.
What does this lab look like in the classroom?
Students work individually or in small groups to choose locations around the school to test. They may swab desks, lockers, doorknobs, tables, or other surfaces, then inoculate their agar plates and wait for growth to appear. Once the plates have incubated, students count colonies, compare class data, and look for patterns in the results.
One of the reasons this lab is so engaging is that students always have predictions about which parts of the school will be the dirtiest. They usually expect bathrooms or cafeterias to have the most bacterial growth, but the results are often very different. In my classes, lockers have frequently had some of the highest counts, which leads to great class discussion.
Why teachers like this microorganisms lab
This bacteria lab is simple to set up, easy to manage, and highly motivating for students. It gives them a real world investigation without requiring complicated materials or an extensive background in microbiology. Because students are testing familiar places in their own school, they are immediately interested in the outcome.
It is also flexible. You can use it as an introduction to microorganisms, as part of a bacteria unit, or as a high interest lab that reinforces scientific observation and data analysis. Students can record observations on the provided lab sheets, answer analysis questions, and discuss why the results may or may not be fully reliable.
Materials needed for the lab
If you are wondering whether this lab is doable in a typical classroom, the materials are very manageable. Most of what you need is already in your classroom or lab. An incubator can be helpful, but it is optional, which makes this lab much easier to use in a variety of school settings.
A quick safety note
This activity is designed to be engaging and eye opening for students, but it is important to follow safe lab procedures. Petri dishes should be sealed with tape, and students should not reopen the dishes after bacterial growth has occurred. That makes it possible to observe the results while still keeping the lab safe and appropriate for classroom use.
Want a ready to use version of this lab?
If you would like a classroom ready version of this bacteria lab for high school biology, you can find it in my Teachers Pay Teachers store. The resource includes the student lab handout, data tables, analysis questions, teacher guide, safety information, and answer key so you can implement the lab more easily in your own classroom.
Bacteria Lab Activity for High School Biology on Teachers Pay Teachers
Related resources and blog posts
If you are teaching bacteria or microorganisms, these related blog posts may also be helpful:
Lab: Effectiveness of Antiseptics and Disinfectants on Bacterial Growth
This is a great follow up lab if you want students to continue working with bacteria while exploring how antiseptics and disinfectants affect bacterial growth.
Viruses and Bacteria Interactive Notebook Pages
If you want a companion resource for note taking and concept reinforcement, these interactive notebook pages work well alongside a bacteria unit.
You might also like these related TpT resources:
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