This is an introductory lesson about food webs and relationships among organisms in an ecosystem. It is understood that from past units of study students are familiar with the terms “ecosystem” and “organism”.

Learning Objectives

  • The learner will differentiate among the three different types of relationships – mutualism, parasitic, and commensalism.
  • The learner will identify the relationships within a food web.
  • The learner will relate the effects of the relationships to the food web.


For the full lesson plan, download the PDF.