Earthworm Dissection Worksheet
Explore the external and internal anatomy of an earthworm through this dissection worksheet. Identify key structures and understand their functions.
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Earthworm Dissection Worksheet
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Carefully read each question and follow the instructions. Use your knowledge of earthworm anatomy and dissection procedures to answer thoroughly.
External Anatomy
1. Observe the external features of the earthworm. Identify and label the following parts on the diagram below:
a. Anterior end (mouth)
b. Posterior end (anus)
c. Clitellum
d. Segments
e. Setae (bristles)
2. What is the primary function of the clitellum in earthworms?
Internal Anatomy
3. Identify the internal organs of the earthworm. Label the following structures on the diagram below:
a. Pharynx
b. Esophagus
c. Crop
d. Gizzard
e. Intestine
f. Aortic arches ('hearts')
g. Dorsal blood vessel
h. Ventral nerve cord
4. Describe the pathway of food through the earthworm's digestive system, naming each organ it passes through.
5. Which of the following is responsible for grinding food in an earthworm?
Crop
Gizzard
Intestine
Pharynx
6. Earthworms have an open circulatory system.
True
False
7. Explain the function of the setae in earthworm locomotion.
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