Author(s): Nancy Moreno, PhD, and Barbara Tharp, MS.
- In addition to mercury and lead, the pesticide, DDT, is another chemical that can become concentrated in the body tissues of animals near the top of the food chain. The presence of DDT in food chains has been associated with reduced populations of several large predatory birds and other organisms. Ask students, What can you find out about DDT use in the U.S., and about the actions taken to make sure it does not become concentrated in food sources for people and animals?
- Fat is created to store extra energy in our bodies when more food is taken in than is used. However, many toxic chemicals also are stored in the fatty tissues of animals’ bodies. Visit the library or Internet to find more information about the role of fat in the body.
Keywords: lesson | experiment | extensions | food | food chain | food web | pollution | toxic chemicals | consumers | producers
- Illustration of DDT molecular structure courtesy of of Lukáš Mižoch. Released into the public domain.
- Photo of mercury © Bionerd CC-BY-SA 3.0.
- Moreno N., and B. Tharp. (2011). The Science of Food: Teacher’s Guide. Fourth edition. Baylor College of Medicine. ISBN: 978-1-888997-76-7.
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Funded by the following grant(s)
My Health My World: National Dissemination
Grant Number: 5R25ES009259
The Environment as a Context for Opportunities in Schools
Grant Number: 5R25ES010698, R25ES06932