Authentic Science Activity


Click here to download a pdf of the Worm Lab Directions

Dorsal Blood Vessel


Key terms: toxicity, pulse rate, blood circulation, Phylum Annelida, Class Oligochaeta, freshwater invertebrate


Purpose:
a model for students to conduct real experiments that they design based on a simple “model organism”known as black worms. With very little effort it is possible to provide students

The student will be able to observe and record the pulse rate of Lumbriculus variegatus ( an aquatic segmented worm).

The student will design and carry out an experiment showing the effect of various substances on the pulse rate of Lumbriculus variegatus.

Follow the link to an Adobe PDF copy of this lab developed by Randy Dix and the American Physiology Society. Additional teaching resources at my site.

http://teachers.olathe.k12.ks.us/~rdixon/workshop.htm

These worms were made famous by the late Charlie Drewes and many of the techniques are of his design. His website is an invaluable resource and many thanks go to those that maintain and support his teachings. http://www.eeob.iastate.edu/faculty/DrewesC/htdocs/ Continue reading “Authentic Science Activity”

Last September’s KABT meeting at Cowley County Community College

KABT folks:

This is a partial reposting from the Teaching Biology Blog…

We had a great time at the KABT Fall meeting at Cowley County College.
Thanks to Michelle, the presenters and others.

Todd, Bill and others should have a report from the meeting. I’m adding some picts that I took:

Getting fueled and ready to go:

Meeting Start

One of the “hands-on” lab experiences. In this case a lab that investigates CO2 data sets and the effects of heating different amounts of CO2 in closed containers.

CO2 Lab

Maybe Sandy was catching a wiff of something more than CO2….

Sandy looks aghast….

We’ll try and get a program up and more reports on the meeting here in KABT news….

In the afternoon some of us went out to the Chaplin Nature center. One of the beasts observed was this antlion:

Antlion

Antlion pits from another site:

Antlion pits

During the field trip out at Chaplin Nature center a group of us came across large numbers of caterpillars defoliating catalpa saplings. The trees themselves were difficult to identify (since they were defoliated and small saplings) and we weren’t sure about the caterpillars. I guessed that they were some sort of horn worm—well guesses sometimes workout. We apparently had found the dark form of the Catalpa sphinx (hormworms). Here’s a link that includes images.

http://www.ag.auburn.edu/enpl/bulletins/catalpasphinx/catalpasphinx.htm

or
http://insects.tamu.edu/fieldguide/cimg305.html
or
http://entomology.unl.edu/ornamentals/pestprofiles/catsphinx.htm

Ours matches the dark form in the bottom of this image:

http://www.ag.auburn.edu/enpl/bulletins/catalpasphinx/photo6.htm

or in this image:

http://www.ag.auburn.edu/enpl/bulletins/catalpasphinx/photo2.htm

BW