Earthworm Dissection Make-Up Assignment
If you were absent on Friday, November 13, earthworm dissection day, you need to
complete the following assignment using the online dissection tool in addition to the in
class “Earthworm Dissection Lab” report. If you were absent and do not turn in this
make-up assignment with your lab report, you will not receive credit for the lab report.
Go to the following website:
Google Search Earthworm online dissection
http://www.mhhe.com/biosci/genbio/virtual_labs/BL_14/BL_14.html
Directions:
I. Read: Question:"What are the structures and body systems of an earthworm"(found on left side of
screen)
II. Answer the questions using complete sentences on a sheet of notebook paper.
a.) What is another name for segmented worm?
b.) What does segmentation support?
d.) What is a coelom?
c.) What is the basic body plan of a segmented worm?
d.) What is the term used for producing both sperm and eggs?
e.) How do earthworms get food?
f.) How do earthworms help the soil and plants?
III.
Read page 1-8 of the Lab Manual (hint: it is found on the bottom right hand corner of the
screen)
IV.
Answer the questions using complete sentences on a sheet of notebook paper.
Page 1 Questions- External Anatomy:
a.) What do scientists call the front end of the worm? The back end of the worm?
b.) What is the top side of the worm called? What is the bottom side of the worm called?
c.) How is a worm's body divided?
d.) What does an earthworm use setae for?
e.) At what segments are the mouth and anus located?
Page 2 questions- External Anatomy:
a.) What is the function of the clitellum?
Page 3 questions-External Anatomy:
a.) Where do the oviducts have small openings next to? On what segment?
Page 4 questions- Internal Anatomy :
Look over the internal anatomy. You will have to label this diagram later.
a.) What systems are visible in this dissected worm?
Page 5 questions- The Digestive System
a.) What kind of digestive tract do earthworms have? Where does it run from?
b.) List the order of the structures of the digestive system from mouth cavity anus.
Mouth ___________ ______________ ______________ ______________ _____________ anus
c.) How does the pharynx aide is digestion?
d.) What is the function of the crop?
e.) What is the function of the gizzard?
Page 6 questions- Nervous System
a.) Where is the simple brain located?
b.) What does the simple brain consist of?
Page 7 questions- Excretory System
a.) What are nephridia?
Page 8 questions- Reproductive System
a.) The earthworm is a hermaphrodite. What does that mean?
V. Click on the External Anatomy button to view a diagram of the external
features of an earthworm. Drag and drop the labels to the matching structures of the
illustration. Click on the Check button to receive feedback on whether the labels are matched
with the correct structure. Correct the highlighted incorrect labels on the diagram.
VI.
Click on the Internal Anatomy button to view a diagram of the internal
features of an earthworm. . Drag and drop the labels to the matching structures of the
illustration. Click on the Check button to receive feedback on whether the labels are matched
with the correct structure. Correct the highlighted incorrect labels on the diagram.