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High School Food Safety Lessons

Lesson 1B Bacteria Everywhere
Laboratory Lesson

National Health Education Standards
(grades 9-11) 1:1, 1:5
Time: One 45-minute laboratory period; this lesson follows 1A
teacher note
This lesson is discrete and can be taught as a single lesson or in conjunction with others in this series. The Teacher Resources include pre-and post-tests for this lesson; these may be used at the teacher's discretion. The lesson includes three activities.
Student Learning Objectives
  1. Students will understand that different bacteria have different characteristics (i.e., bacteria cluster in colonies), different size, shape, etc.
  2. Students will understand that different strains of bacteria can be identified by colony morphology (colony characteristics).
  3. Students will learn that they cannot identify good vs. harmful bacteria with this laboratory experiment.
  4. Students gain awareness that bacteria are everywhere, and that different surfaces have different levels of organisms, will be increased.
  5. Students will become aware that not all bacteria is harmful; in fact, most bacteria are beneficial.
Required materials
  • Petri dishes with bacteria multiplying
  • Bacteria Everywhere Data Table for each team
  • Food Safety A to Z Reference Guide * (See the following terms—Bacteria, Cross-Contamination, Foodborne Illness, Four Steps to Food Safety, Fungus, Hand washing, Micro-organism, Mold, and Pathogen) Also see the 4Cs section beginning on pages 54.
  • Science and Our Food Supply: Investigating Food Safety from Farm to Table; Teacher's Guide for High School Level Science Classrooms (2001)*
  • Dr. X and the Quest for Food Safety video, Module 1, Understanding Bacteria*

    *Publications and videos listed above may be obtained from the National Science Teacher's Association, (703)243-7100), www.nsta.org.

Preparation
teacher note

This lesson was drawn from the first module in Science and Our Food Supply: Investigating Food Safety from Farm to Table: Teacher's Guide for High School Science Classroom (National Science Teacher's Association, (703)243-7100).

This innovative and supplemental curriculum introduces students to the fundamentals of microbiology while at the same time imparting important public health information.

The curricula found in Science Our Food Supply were developed in cooperation with the U.S. Food and Drug Administration (FDA). The curricula that you will be using includes two laboratory lessons and three public health lessons. In different formats, these lessons are in Science and Our Food Supply. The lessons have all been tested by an experienced team of middle level teachers and meet National Science Education Standards.

*Permission has been granted in advance for the reproduction of these print materials in their entirety.
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