1. Define: leech, molting, bivalve, exoskeleton, arthropod, annelids, open circulator system, setae,
appendages, mantle, radula, crop, gizzard, gills, mollusks, spiracles, metamorphosis
2. Label each of the following organisms with the correct classifications:
Pill bugs crustaceans
Spiders arachnids
Scorpions arachnids
Grasshoppers insects
Crab crustaceans
Crawfish crustaceans
Starfish Echinoderms
Ant insect
Fly insect
Snail gastropod
Clam bivalve
Oyster bivalve
Squid cephalopod
sea star echinoderm
lobster crustaceans
sand dollar echinoderm
sea urchin echinoderm
3. Cephalopods number of shells, gastropods number of shells, bivalves, number of shells
C=0 g=1 b=2
4. Centipedes and millipedes how are legs and segments divided?
Centipedes have one leg per segment, millipedes have two legs per segment
5. What organism has a radula?
gastropods
6. What do earthworms eat?
Soil
7. What do leeches eat?
Blood of other animals
8. Segmented worms probably evolved in the sea and has a common ancestor with which other
group?
Mollusks
9. What kind of circulatory system does a mollusk have?
Most have open cc, cephalopods have a closed cc
10. What kind of circulatory stems doe segmented worms have?
Closed
11. How can insects to harmful to us?
Eat our crops, sting us, carry some disease
12. What is the largest group of mollusks?
Gastropods
13. Where do echinoderms live?
In the ocean
14. Are Echinoderms vertebrates or invertebrates?
Invertebrates
15. Explain the water vascular system and the tube feet of echinoderms and how are they related.
The water vascular system is connect to the tube feet of echinoderms
16. What kind of skeleton do echinoderms have?
Endoskeleton covered by bumpy or spiny epidermis
17. How are leeches useful to humans?
They secrete a substance that prevents blood from clotting.. (used when doing surgery)
18. How do segmented worms reproduce?
They are hermaphrodites the must exchange sperm with another earthworm to reproduce.
19. Explain the difference between complete and incomplete metamorphosis. How many steps are
in each and list the steps.
3 steps in incomplete , 4 steps in complete and complete has a pupa
20. What is the outer covering of all arthropods called?
Exoskeletons
21. Where is the soil grinded in an earthworm?
gizzard
22. Shedding of an organisms exoskeleton is called what?
Molting
23. Where do segmented worms live and where are their organs found?
Soil, freshwater, and saltwater ,,, in a body cavity that holds organs
24. What arthropod has 8 legs?
Arachnid
25. What arthropod has five pairs of walking legs?
Crustaceans