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The Arizona Hedgehog
Cactus:
Endangered Species or not?
Lesson 1: Presentation of the Problem
Purpose:
To introduce the students to the research question
through a slide show, overhead transparency and discussion.
Time:
One 50-60 minute class period
Materials Preparation:
- Computer and internet access (individual computers
or projection mechanism)
- Overhead transparency of "Possible Phylogeny and
Ploidy Levels of Claret-Cup Cacti"
- Student copies of "The Arizona Hedgehog Cactus:
Endangered Species or Not?"
- Student copies of "Classification of Echinocereus
triglochidiatus and Geographical Ranges of its Varieties".
Student Objectives:
- List the morphological characters used to identify
the cacti in the field, and describe the associated problems in
using these characters for identification.
- Draw the geographical ranges of the varieties of
species Echinocereus triglochidiatus.
Lesson
Plan:
- Present slides in the order given. Refer to "Investigation
of the Problem- Internet Slide Show". A narration is included. Students
may view the slide show in small groups or, if a multimedia hookup
is available, the slide show may be projected through the computer
onto a class television.
- Students complete
the activity sheet entitled "Investigation of the Problem" as they
watch and listen to the slide presentation.
- Present the research question to the class: Are
the cacti in Cochise county similar enough to the cacti at the type
locality of arizonicus to be considered the same variety?
Hand out background reading material, "The Arizona Hedgehog Cactus:
Endangered Species or Not?" Hand out and explain the homework assignment,
"Classification of Echinocereus triglochidiatus and Geographical
Ranges of its Varieties."
Supplemental Materials:
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