AP Biology: Unit 7: Animal Diversity: Virtual Lab #12: Earthworm Dissection
Procedure:
1. Open the Virtual Lab entitled “Earthworm Dissection”.
http://www.glencoe.com/sites/common_assets/advanced_placement/mader10e/virtual_labs_2K8/
labs/BL_17/index.html
2. The left side of the page contains background information and instructions in the “Question”
area. Read the background information found under the “Question” area first, and then continue
on to reading the procedure information posted there as well.
3. At this point, you are ready to begin the lab exercise.
a. In this exercise, you will investigate the anatomy and organ system structure of an
earthworm. To begin, click on the “External Anatomy” button to view external structures
and positions on the earthworm model. Based upon the information you have read in the
“Question” and “Earthworm Guide” areas, please click and drag the labels to their correct
positions on the earthworm model. Click “Check” to verify your answers. If any are
incorrect, please make the proper selections to complete the exercise. When you are
through, please fill in the labels in Figure 1 below.
Figure 1:
b. Next, click on the “Internal Anatomy” button to view internal organs on the earthworm
model. Based upon the information you have read in the “Question” and “Earthworm
Guide” areas, please click and drag the labels to their correct positions on the earthworm
model. Click “Check” to verify your answers. If any are incorrect, please make the
proper selections to complete the exercise. When you are through, please fill in the labels
in Figure 2 below.
Figure 2:
4. When you are finished, please answer all of the questions found below.
Questions:
1.
Earthworms belong to the Class:
a. Annelida
b. Oligochaeta
c. Lumbricus
d. terrestris
2.
A coelom is a(n):
a. Brain
b. Blood vessel
c. Body cavity
d. Hair-like projection
3. Annelids:
a. Are segmented
b. Do not have a coelom
c. Have a single body opening
d. All of the above
4.
Annelids exhibit which type of symmetry?
a. Radial
b. Bilateral
c. None, they are asymmetrical
5.
Earthworms:
a. Are monoecious
b. Are omnivores
c. Are viviparous
d. None of the above
6.
You find many earthworms living in your garden. Based on what you’ve learned about their
soil activity, would you expect your plants to grow:
a. Better
b. Worse
7.
Which of the following is the found anterior to the other structures on the earthworm?
a. Crop
b. Gizzard
c. Intestine
d. Aortic arches
8. Setae are found:
a. Internally within the earthworm
b. On the dorsal side
c. On the ventral side
d. All of the above
9.
During copulation, the clitellum of one worm aligns with which structure on the other worm?
a. Nephridia
b. Seminal receptacle openings
c. Clitellum
d. Testes
10. Nephridia play a role in:
a. Reproduction
b. Respiration
c. Excretion
d. Circulation
11. What part of the digestive system would you see in a cross-section anterior to the gizzard?
12. What structure in the earthworm has a similar function as the human heart? Explain your answer.
13. What do two earthworms exchange during mating? Explain your answer.
14. Describe the difference between a closed and an open circulatory system.
15. What characteristics distinguish an annelid from other worms?