Toxic or Not Image Map
Who Are Sam and Ella? imageIntroduction image
To the Teacher:
In teaching this lesson, it will be useful to refer to the Teachers' Pages before you begin, to give you vital information associated with the unit. You will need an Authorware Web Player plug-in for the Activity and Test Your Knowledge sections.  If your computer does not have the plug-in, Click here for the plug-in.

One of the ways we encounter environmental hazards is through the food we eat.

Substances or organisms in or on our food and water enter the digestive system and may cause serious problems throughout the body.

In this lesson you will learn about substances (such as food additives and chemicals), and organisms (such as bacteria and viruses), and the problems they can cause in the body.

So who are Sam and Ella? You'll find out if you read the lesson carefully.

Objectives image

By the end of this lesson you should be able to:

  • Identify the rules for food safety
  • Identify sources of food-borne illnesses and contaminants


Instructions image
Begin by clicking on the "Pre-Test" link to the left, then proceed with the rest of this unit by clicking on the "Lesson" link to the left.  When you get to the lesson guides, read each one.  When you are finished, return to this page to continue on to the activity and then to the post-test.