Reflection: Classroom Setup Everybody's got to eat: Food Webs and Energy Pyramids - Section 3: Discussion


Sometimes it helps to put things on the board.  In this case, I had students draw energy pyramids with their groups (as described in the discussion guide for this lesson).  

Then, I drew a pyramid on the board based on their input to represent the "10% rule".  The things written in black on the pyramid are some of the environmental costs that students identified with adding the extra trophic level of meat production.  


As you can see from this student's pre-discussion analysis of the relationship between vegetarianism and the environment, it was necessary to make sure the whole class understood the 10% rule and energy pyramids before really discussing the issue of the environmental ramifications of meat consumption.

  Classroom Setup: You can put it on the board!
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Everybody's got to eat: Food Webs and Energy Pyramids

Unit 3: Ecology
Lesson 2 of 8

Objective: Students will be able to explain how the dynamics of food webs in an ecosystem are determined by limitations of energy transfer from one trophic level to another.

Big Idea: Organisms are composed of matter but require energy to function. Ecological feeding relationships can thus be understood as transfers of energy and recycling of matter.

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