Worms Review Key
Name:_________________
1. What do we call animals with both male and female reproductive parts? hermaphroditic
a. Which of the worm phyla have this characteristic?
Platyhelminthes (flatworms) and Annelida (segmented worms)
2. What do we call the process of asexual reproduction where an animal split in half will replace
lost body parts?
regeneration
a. Which of the worm phyla have this characteristic?
Platyhelminthes (flatworms)
3. Draw in the boxes below a cross section of each of the following body plans. Remember to
label the three tissue layers. Then name which worm phylum has each.
Look at notes
Acoelomate
Phylum Platyhelminthes
Look at notes
Look at notes
Pseudocoelomate
Phylum_Nematoda
Coelomate
Phylum__Annelida
6. What is the benefit of having a coelom?
Body cavity that holds the organs
7. List the parasitic ROUNDWORMS. Then give the symptoms for each and how it can be
contracted.
a. ___Ascaris_____ - contracted by human/dog feces (hand to mouth)
-abdominal pain, vomiting
b. ___Pinworm_______-contracted by hand to mouth/ dirty bed sheets, underwear
-itchy anus (eggs on anus)
c. ___Hookworm____- contracted by human feces w/ eggs reaching soil & person
walks on soil which eggs imbed into skin
-diarrhea, abdominal pain, nausea
d. ___Trichinella______- contracted by poorly cooked pork
-causes abdominal pain and muscle soreness
8. What are a few ways to avoid being infected by a roundworm?
Wash hands, cook pork properly
9. What type of symmetry is common to all 3 phlya of worms?__bilateral symmetry
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10. What phylum does a planarian belong to?_______Platyhelminthes__________________
11. What structure removes digested waste from a planarian?____pharynx_____ ________
12. What is the first phylum on the evolutionary tree to have two tissue/germ layers?
Cnidaria (jellyfish)
13. What is the first phylum on the tree to have three germ/tissue layers?
Platyhelminthes (flatworms)
a. What is the third tissue layer to be added? mesoderm
b. What structures arises from that layer?
Bone and muscle and circulatory system
14. Draw a planarian below and label the following: Ganglia, Lateral Nerve Cord, Pharynx,
Mouth/Anus
-examine diagram pg 728 and note sheet
15. How does an earthworm breathe?
diffusion
16. Does an earthworm have a brain? Explain.
Yes, called a cerebral ganglion makes a simple decisions like mating and movement
17. What happens to an earthworm when it dries out in the sun?
-Can’t breathe because diffusion requires a moist surface to move the oxygen and
carbon dioxide
18. What is the function of the crop in an earthworm?
-temporary storage of food
19. What is the function of the gizzard in an earthworm?
-grinds up food before it moves to the intestine
20. Which phylums has nephridia? ____Annelida______________ What is their function?
-excrete liquid waste
21. Which structure of an earthworm secretes a cocoon for mating?
-clitellum
22. Which phylum do leeches belong to?
Annelida
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23. Explain the circulatory system of an earthworm. What do we call it’s “heart”?
-Has 5 aortic arches that secrete blood into a closed circulatory system (where the
blood is enclosed within blood vessels) and it is secreted to the dorsal blood vessel
and then it loops around to the ventral blood vessel where it is pumped back to the
heart.
24. How do earthworms benefit gardeners?
-as the burrow through the soil they open it up so water flows better and the roots
have room to grow
25. Trace the path of a piece of food as it travels through an earthworm.
-mouth, pharynx, esophagus, crop, gizzard, intestine, anus
Draw an earthworm below and label its:
Gizzard
Pharynx
Cerebral ganglia
Crop
Dorsal blood vessel
Aortic arch / heart
Nephridia
Ventral blood vessel
Esophagus
Clitellum
Mouth
Nerve Cord
Anus
-examine diagram in book pg 751
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Matching:Match the following characteristics to the correct worm phyla by writing P, N or A next to
the phrase.
P= Platyhelminthes
N=Nematoda
A=Annelida
1. Coelomate _____A_____
13. Regeneration____P______
2. Pseudocoelomate ____N______
14. Hermaphroditic___P,A_______
3. Acoelomate___P_______
15. Separate Sexes_____N_____
4. Round Worms______N___
16. Can do asexual reproduction___P__
5. Segmented Worms______A____
17. Can do sexual reproduction___N,A_____
6. Flatworms____P______
18. Clitellum___A___
7. Has blood____A______
19. internal digestion___P,N,A___
8. No blood____P,N______
20. 1-way gut system (Two separate openings
9. Has a heart____A______
10. No heart____P,N______
11. Gizzard and Crop____A______
12. Setae_____A_____
for mouth/anus) __N,A_____
21. Two way gut system (One opening for
mouth/anus) ______P____
22. Flame cells _____P_____
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