What is a Worm?
What type of symmetry do all worms have?
Bilateral
What does the name "Platyhelminthes" mean?
Flat worms
How big is the average nematode?
Microscopic
What does the name "Annelida" mean and what does it refer to?
"Little ring" - body segments
What is cephalization?
High nerve cell density - Head
Name 3 potential worm food sources
Humus, meat, plants, blood, zooplankton, etc.
What are two types of platyhelminthian worms?
Tapeworms, Planarians, Flukes, etc.
Where are most nematode species found?
Soil
What are Oligochaetes?
Earthworms
What is a nerve ring and what type of organism has it?
Primitive brain - Nematodes
How many germ layers do worm embryos have during early development?
3
Why is it a bad idea to pick up a Hammerhead worm?
Rat-lungworm
How many species of nematodes do scientists hypothesize may exist?
1 million +
What taxon do leeches belong to?
Hirudinea
What is the main benefit of bilateral symmetry in biology?
What is the most abundant animal on earth?
Nematodes
What are proglottids?
Tapeworm body segments used for reporduction
What protects the nematode's body?
Cuticle
What are polychaetes and what does their name refer to?
Marine segmented worms - "many hairs" - parapodia
What are flame cells?
Cells within the protonephridia of flatworms - part of the excretory system
Name 3 ecological roles of specific worm types
Answers may vary: food sources, predators, soil aerators, etc.
How does a tapeworm feed?
Diffusion and attachment via the scolex to the intestine
What structure in the mouth of a nematode is used to burrow into its food?
Stylet
What characteristic forces annelids to live in wet environments?
Wet skin - breathing by diffusion
What is the best worm (not evil)?
Planarians (Turbellarians)