Unit Plan
Texas Education Agency

Texas Gateway: Dichotomous Key

For Students 9th - 10th
This tutorial is introduces students to the usage of the dichotomous key.
Interactive
Oregon State University

Oregon State University: Dichotomous Key

For Students 9th - 10th
An excellent starting point. Get a good description of what the dichotomous key for tree identification is and then directions for using it to identify trees.
Activity
PBS

Nova Teachers: Treasures of the Great Barrier Reef: Classroom Activity

For Teachers 9th - 10th
This activity involves having students classify nine fish according to various physical characteristics. They can also develop a key to identify the fish.

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