Name ___________________________________________________________________________ Date____________ Period_____
Annelid Webquest
http://animaldiversity.ummz.umich.edu/site/accounts/information/Annelida.html
1. What are the three common types of annelids? ______________________________________________________________
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2. What is segmentation? _________________________________________________________________________________
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3. Segmentation is also known as ________________________________________.
4. Why is metamerism a benefit? ___________________________________________________________________________
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5. All annelids, except leeches, have ________________________________.
6. Why does hydrostatic pressure allow the annelid to do? _______________________________________________________
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7. Describe the following “systems” of the annelid:
a. Circulatory system: _____________________________________________________________________________
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b. Digestive system: ______________________________________________________________________________
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c. Respiratory system: ____________________________________________________________________________
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d. Excretory system: ______________________________________________________________________________
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e. Sensory organs: _______________________________________________________________________________
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f. Reproductive system: ___________________________________________________________________________
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https://en.wikipedia.org/wiki/Annelid
8. Where does the name annelid come from? _________________________________________________________________
9. What do segmented worms have visually that roundworms do not? ______________________________________________
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10. What is used to divide annelids into three classes? _______________________________________________.
11. Describe the three classes:
a. Oligochaeta: __________________________________________________________________________________
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b. Polychaeta: ___________________________________________________________________________________
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c. Hirudinia: _____________________________________________________________________________________
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http://www.infusion.allconet.org/webquest/annelida.html
12. What are the segments of an annelid separated by? ______________________________________________.
13. Label the parts of the earthworm’s digestive system. Describe what the crop, gizzard and pharynx do.
14. Earthworms have a closed open circulatory system. Circle the correct answer.
15. The earthworm has one ___________ blood vessel and several ____________ blood vessels. Together with _______ pairs
of _________________ they pump blood throughout the body. Both the hearts and vessels have _______________ that
prevent _____________________________.
16. What do the nephridia do for the earthworm? ________________________________________________________________
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17. Where are the light-sensitive cells of the earthworm concentrated? Why is this? ____________________________________
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18. Using what you know about the importance of an earthworm’s moist skin, why do you think the earthworm’s moisture
detection cells are the most sensitive? _____________________________________________________________________
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19. What is tagmosis? Is this a benefit or detriment? Why do you think that? __________________________________________
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20. What are the two ways leeches get “in” to their food source? ____________________________________________________
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http://www.onlinetips.org/earthworms
21. List four benefits of an earthworm:
a. _____________________________________________________________________________________________
b. _____________________________________________________________________________________________
c. _____________________________________________________________________________________________
d. _____________________________________________________________________________________________
22. During digestion, what soluble nutrients do they add to their waste? ______________________________________________
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23. Describe earthworm activity in each of the seasons:
a. _____________________________________________________________________________________________
b. _____________________________________________________________________________________________
c. _____________________________________________________________________________________________
d. _____________________________________________________________________________________________
24. A worm’s survival is most effected by ____________________________.