Lesson Plan

Ecosystem Interactions Among Organisms


Grade Levels

Related Academic Standards

Assessment Anchors

Eligible Content

Big Ideas




In this lesson, students learn about organism interactions in lotic and lentic ecosystems. Students will:

  • describe the ecological roles of organisms in lotic and lentic ecosystems.
  • describe interactions among organisms in ecosystems.
  • explain the concept of trophic levels in an ecosystem.

Essential Questions

Essential questions haven't been entered into the lesson plan.


  • Consumer: Organism that does not make its own energy. Consumers can be plant eaters (herbivores), meat eaters (carnivores), plant and meat eaters (omnivores), or scavengers, which eat dead things or detritus (detritivores).
  • Decomposer: Bacteria or other organisms that break down dead organisms into nutrients that can return to the soil.
  • Energy Pyramid: Diagram that shows the amounts of energy as it is transferred through a food chain.
  • Food Web: A group of connected food chains that shows feeding relationships in an ecosystem.
  • Habitat: Place where a plant or animal lives.
  • Predator: An organism that captures, kills, and eats another organism.
  • Prey: An organism that is eaten by a predator.
  • Primary Consumer: Animal that eats producers (e.g., rabbit, cow).
  • Producer: Green plant or plant-like protist that makes its own food by photosynthesis.
  • Secondary Consumer: Animal that eats other secondary consumers and others below on the food chain (e.g., snake, fox).
  • Tertiary Consumer: Consumer that eats other tertiary consumers and others below on the food chain
  • Trophic Level: The feeding level of an organism in a food chain (e.g., producer, primary consumer, secondary consumer).


90 minutes/2 class periods

Prerequisite Skills


Related Unit and Lesson Plans

Related Materials & Resources

The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this lesson plan.

  • Wetlands Ecosystem Study Unit (teacher resource)


  • Identify the Food Chains: A Food Web (student activity)


  • Create a Food Web (student activity)


  • Food Chains and Food Webs (tutorial)


Formative Assessment


Suggested Instructional Supports


Instructional Procedures


Related Instructional Videos

Instructional videos haven't been assigned to the lesson plan.

  • Current Rating



Comments haven't been posted about the lesson plan.
Standards Aligned System
Data is Loading...

Under Construction
Thank you for your patience. Not all features of the site are currently available.