Earthworm Anatomy Worksheet
A Grade 7 science worksheet covering the external and internal anatomy of an earthworm, including labeling and short answer questions.
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Earthworm Anatomy
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Read each question carefully and answer to the best of your ability. Use the provided diagrams to help you with labeling and identification.
Part 1: External Anatomy
1. Label the following external structures of the earthworm:
a. Clitellum:
b. Mouth:
c. Anus:
d. Segments:
2. What is the function of the clitellum?
Part 2: Internal Anatomy
3. Label the following internal organs of the earthworm:
a. Pharynx:
b. Esophagus:
c. Crop:
d. Gizzard:
e. Intestine:
f. Hearts (Aortic Arches):
4. What is the primary role of the gizzard in an earthworm's digestive system?
Part 3: Multiple Choice
5. Earthworms are segmented animals. What does this mean?
They have a backbone.
Their bodies are divided into repeating sections.
They have an exoskeleton.
They have wings for flight.
6. Which part of the earthworm's digestive system stores food temporarily before digestion?
Gizzard
Intestine
Crop
Pharynx
Part 4: Short Answer
7. Describe two ways earthworms contribute to soil health.
8. Explain why earthworms are considered to have a 'closed' circulatory system.