In this activity students make yogurt. Next, they compare both the milk and yogurt under a microscope to see the huge number of bacteria present in the yogurt but absent in the milk. Before refrigeration was common, people used fermentation as a means of preservation. Here students study the process up close. 

 

Use this to learn and reinforce answers to questions such as:

❑  Individual bacteria can only be seen under a microscope

❑  Many bacteria are beneficial

❑  Microorganisms are a key component in fermentation

 

Once students try this activity, they can capture their observations using the included Lab Notes or probing questions included in the instructions. 

 

Concepts Addressed

♦  How did people preserve excess milk before refrigeration?

♦  Are all bacteria harmful?

♦  What do bacteria look like under a microscope?

 

Answer Keys and Teacher Notes address most questions and issues that might arise in this study—you shouldn’t have to do any outside research unless you want to.

 

Materials Needed  Milk, thermometer, hot plate, sauce pan, yogurt (spoonful), thermos, food coloring, microscope slide and coverslip, pipette, plastic cup, water

 

Prep Needed  Gather supplies

 

Teaching Time   2 days

 

Student Sheets   Scaffolded writing prompts & lab reporting 

 

Connect with me… If you have questions or problems, please let me know in the Q&A section and I’ll get back to you asap.

 

Terms of Use

Copyright © Carolyn Balch. All rights reserved by the author. This product is to be used by the original downloader only. Copying for more than one teacher, classroom, department, school, or school system is prohibited. This product may not be distributed or displayed digitally for public view. Failure to comply is a copyright infringement and a violation of the Digital Millennium Copyright Act (DMCA). Clipart and elements found in this PDF are copyrighted and cannot be extracted and used outside of this file without permission or license. Intended for classroom and personal use ONLY.

Making and Analyzing Yogurt: Investigating Bacteria Under a Microscope

$3.00Price

    Answer Keys and Teacher Notes address most questions and issues that might arise in this study—you shouldn’t have to do any outside research unless you want to.

    Connect with me: If you have questions or problems, please let me know and I’ll get back to you as soon as I can.

     

    This resource (along with all resources sold on this site) can be found inside the membership. For information on that option, click here.

    Terms of Use   Copyright © Carolyn Balch. All rights reserved by the author. This product is to be used by the original downloader only. Copying for more than one teacher, classroom, department, school, or school system is prohibited. This product may not be distributed or displayed digitally for public view. Failure to comply is a copyright infringement and a violation of the Digital Millennium Copyright Act (DMCA). Clipart and elements found in this PDF are copyrighted and cannot be extracted and used outside of this file without permission or license. Intended for classroom and personal use ONLY.