Is Organic Food Worth the Extra Cost?

Taken From: EHP (Environmental Health Perspective):
http://www.ehponline.org/science-ed/2006/pesti.pdf  [PDF]
Editor: Stephanie Nardei


To access this lesson, please go directly to the original website listed above.  It fulfills the exploratory inquiry goals of PULSE in its original form.

Part I (Explore): Doing the Calculation


50 minutes


10 -15 minutes


Calculation Worksheets

Students calculate the amount of pesticide residue in various foods for two pesticides and determine if these levels are safe for human consumption

Students will be able to:

  • Calculate the dose of a pesticide using food intake levels and pesticide residue concentrations
  • Evaluate the safety of food pesticide residue food intake levels and pesticide residue concentrations

National Science Education Standard
Content Standard A – Science as Inquiry

  • Identify questions and concepts that guide scientific investigations
  • Formulate and revise scientific explanations and models using logic and evidence
  • Communicate and defend a scientific argument

Content Standard F- Science in Personal and Social Perspectives
Personal and community health

Arizona Science Education Standards:
Concept 1: Observations, Questions, and Hypotheses

  • PO 2. Develop questions from observations that transition into testable hypotheses.
  • PO 3. Formulate a testable hypothesis.

Concept 2: Scientific Testing (Investigating and Modeling)

  • PO 1. Demonstrate safe and ethical procedures (e.g., use and care of technology, materials, organisms) and behavior in all science inquiry.
  • PO 5. Record observations, notes, sketches, questions, and ideas using tools such as journals, charts, graphs, and computers.

Concept 3: Analysis, Conclusions, and Refinements

  • PO 2. Evaluate whether investigational data support or do not support the proposed hypothesis.

Concept 4: Communication

  • PO 2. Produce graphs that communicate data. (See MHS-S2C1-02)
  • PO 3. Communicate results clearly and logically.
  • PO 4. Support conclusions with logical scientific arguments.

Arizona Math Education Standards:
Math Strand 2 - Data Analysis, Probability, & Discrete Mathematics
Concept 1: Data Analysis (Statistics)

  • PO 1. Formulate questions to collect data in contextual situations.
  • PO 2.  Organize collected data into an appropriate graphical representation.
  • PO 3. Display data as lists, tables, matrices, and plots
Strand 5: Structure & Logic
Concept 1: Algorithms and Algorithmic Thinking

Teacher Background

Related and Resource Websites
PULSE Resource Page on GE Foods: http://pulse.pharmacy.arizona.edu/resources/dawn_new/teachers.htm


PULSE is a project of the Community Outreach and Education Program of the Southwest Environmental Health Sciences Center and is funded by:

NIH/NCRR award #16260-01A1
The Community Outreach and Education Program is part of the Southwest Environmental Health Sciences Center: an NIEHS Award


Supported by NIEHS grant # ES06694

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Last update: March 7, 2007
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