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Ecosystems | Activity 2.3

Activity 2.3: Evidence-based Arguments About Biomass Patterns in Ecosystems (40 min)

Students use the results of the Meadow Simulation to recognize a consistent pattern in ecosystems: the biomass in the herbivore population is smaller than the producer biomass, and biomass in the carnivore population is always the smallest.

Materials You Provide

Resources Provided


Prepare a computer and a projector to display the PPT and one copy of 2.3 Evidence-Based Arguments Tool for Ecosystems for each student.


1. Use the instructional model to show students where they are in the course of the unit.

Show slide 2 of the 2.3 Biomass Patterns in Ecosystems PPT.


Remember that at this point in the Unit it is okay for students to have many unanswered questions and incorrect ideas. It is important that they are able to describe the biomass pyramid as a pattern in ecosystems, but they should not be expected to fully explain it at this point. Use the 2.3 Assessing the Evidence-Based Arguments Tool for Ecosystems to get a sense for where students are in their ability to identify the main pattern in this unit: the biomass pyramid.