Tree Classification

Procedure

Part 1: Bean classification

Students will learn the concepts of classification and organization with a dichotomous key.

1. Divide students into small groups (three to four students/group) and distribute paper clips, beans, or other small objects.
2. Have students sort their pile into two classification groups based on some characteristic that is logical to them.
3. Students will write down a name for each group based on the characteristic that was used to split them.
4. Have students divide each primary classification group into further splits, until all the 'species' of small objects have been classified and charted on paper.
5. Call on several groups to share with the class what characteristics they used to classify their objects. Different group may have used different criteria, such as size, shape, color, or composition.
   

Questions:

1. How could you use your chart/key?
2. How do you classify in every day life? (library, silverware drawer, fishing box, etc.).

Part 2: Keying out trees

Students will use dichotomous keys to identify common trees.

1. Introduce the idea that scientists have classified plants in the same way as the students classified their small objects. Scientists use already-developed keys to help discover the identity of plants. Using keys helps scientists from different regions or countries make sure they are talking about the same plant.
2. Tell the class that they are now botanists. What characteristics/clues would they use to classify plants? Generate a list as the students name characteristics, such as needles or broadleaf leaves, deciduous or evergreen, leaves scaly or needle-like, cones or flowers, needles in clusters or singly, etc.
3. If performing this at Great Sand Dunes use this Tree Classification Key at the picnic area or on the Mosca Pass Trail. At school, create a dichotomous key for the species in your area.
4. Mark the teaching area with flagging or establish boundaries. Have each group find a tree and key it out. Rotate groups among different trees for practice using the key.

Critical Thinking

1. Why do people classify things in their world?
2. What are some problems with classifying?
3. Should we classify things?

Extension

1. Plant Adaptations
2. What in the World is a Dichotomous Key?