Biology 11
PLO G3: Kingdom Animailia:
Platyhelminthes, Nematoda,
Annelida Worksheet
Unit 10 Lessons 1 to 3
1. Use a comparison-contrast organizer (see Study Skill Technique
web site) to compare the characteristics of the Phyla
Platyhelminthes, Nematoda, and Annelida. (12 marks)
Phylum: Platyhelminthes
Nematoda
Habitat
Embryonic
Germ Layers
Symmetry
Body Cavity
(Coelom)
Digestion
Circulation
Respiration
Excretion
Nervous
System
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Annelida
2. Contrast the structural features of platyhelminthes, nematodes,
and annelids. Please use words (2 × 3 = 6 marks) and diagrams (2 × 3
= 6 marks) in your answer.
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Platyhelminthes
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Nematodes
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Annelids
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3. What physical adaptations (changes) were necessary for
flatworms to become parasitic? (2 marks)
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4. In the following table, demonstrate knowledge of the ecological
roles of platyhelminthes, nematodes, and annelids. (3 marks)
ANIMAL
ECOLOGICAL ROLE
Platyhelminthes
Nematodes
Annelids
5. What are the characteristics of a successful parasite? (3 marks)
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6. In the following table, compare the evolutionary changes in
platyhelminthes, nematodes, and annelids. (3 marks)
ANIMAL
EVOLUTIONARY CHANGES
Platyhelminthes
Nematodes
Annelids
7. List and describe two human disorders that are caused by nonsegmented nematodes? (2 marks)
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