Worms, Worms, WORMS! Mrs. Howard’s Life Science

Worms, Worms, WORMS!

Roundworms

Flatworms

Segmented worms

Worm Lab Activity

Mrs. Howard’s Life Science

Overview on Worms

All worms have the following in common: They are invertebrates They all have long, narrow bodies without

legs Have tissues, organs, and organ systems Bilateral symmetry Unlike sponges or cnidarians, worms have

distinct head and tail ends.

Worms!

Worms can regenerate!

Segmented worms - if broken, head will regenerate a tail

Flatworms if cut down the middle, will regenerate into 2 new worms

Roundworms Phylum Nematoda

Protection - mouthparts Food - free-living &

parasitic Habitat - everywhere Locomotion - muscle

contractions Examples -

Pinworms,Hookworms, Heartworms, Trichinella

Roundworms Phylum Nematoda

Special Characteristics Digestive System Nervous system Brain & CNS About 1/2 are parasitic

Flatworms Phylum Platyhelminthes

Protection - mouthparts

Food - most are parasitic & live off animals

Habitat - water & land Locomotion - muscle

contractions Examples - Planarian,

Fluke, Tapeworm

Planarian

Flatworms Phylum Platyhelminthes

Special Characteristics

Brain and CNS

Mouth only (no anus)

Segmented Worms Phylum Annelida

Protection - they burrow and wedge inside hole

Food - Earthworms - organic matter in soil Leeches- Blood of host

Habitat - Earthworms - moist soil Leeches-Water and moist environments

Segmented Worms Phylum Annelida

Movement - Muscle contractions

Special Characteristics

Brain and CNS

Most are free-living (except leeches)

Mouth & anus

No heart but have circulatory system

Above should read “breathe through their skin”

Why do earthworms come to the surface when it rains?

Bill Nye will answer:

https://www.youtube.com/watch?v=xWjF26QoQY4

One final type of worm:

There is one final type of worm, I forgot to mention:

THE GUMMY WORM!

CHARACTERISTICS

•Colorful

•Stretchy

•Delicious :)

Gummy Worm Lab

We are going to be observing the property of elasticity in a gummy worm.

Using the Scientific Method we will determine how far a gummy worm can stretch and still retain its shape.

Gummy Worm Lab

THE SCIENTIFIC METHOD

Question or Problem: What is it we are trying to determine?

Hypothesis: Make an Educated Guess on what you think is going to happen?

Experiment: Test your Hypothesis

Gummy Worm Lab Observations: Make careful observations

and record what happens Analysis: Use your experiment or research

to draw conclusions. Was your hypothesis correct?

Results: Present your results by providing a summary of your experiment, hypothesis and conclusions.

Gummy Worm Lab

Specific Instructions are found on the lab handout - have fun!