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Questions and Answers
What is the distinguishing feature of cnidarians?
What is the distinguishing feature of cnidarians?
- Centralized nervous system and exoskeleton
- Segmented body and jointed appendages
- Decentralized nervous system and cnidocytes (correct)
- Bilateral symmetry and mesoglea
What is the composition of cnidarians' bodies?
What is the composition of cnidarians' bodies?
- Endodermis surrounded by mesodermis
- Mesoglea sandwiched between two layers of epithelium (correct)
- Exoskeleton made of chitin
- Endoskeleton made of calcium carbonate
What are the two basic body forms of cnidarians?
What are the two basic body forms of cnidarians?
- Flapping wings and burrowing bodies
- Walking legs and crawling tentacles
- Swimming medusae and sessile polyps (correct)
- Floating disks and creeping stems
What is a characteristic of some free-swimming Cubozoa and Scyphozoa species?
What is a characteristic of some free-swimming Cubozoa and Scyphozoa species?
How are the activities of cnidarians coordinated?
How are the activities of cnidarians coordinated?
Flashcards
Cnidarian distinguishing features?
Cnidarian distinguishing features?
Decentralized nervous system and cnidocytes (stinging cells).
Cnidarian body composition?
Cnidarian body composition?
Mesoglea (a jelly-like substance) sandwiched between two layers of epithelium.
Two Cnidarian body forms?
Two Cnidarian body forms?
Swimming medusae (jellyfish-like) and sessile polyps (coral-like).
Cubozoa and Scyphozoa characteristics?
Cubozoa and Scyphozoa characteristics?
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Cnidarian coordinated activities?
Cnidarian coordinated activities?
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Study Notes
Cnidarian Characteristics
- The distinguishing feature of cnidarians is the presence of stinging cells called cnidocytes.
Body Composition
- Cnidarians' bodies are composed of two main layers: the ectoderm and the endoderm.
Body Forms
- The two basic body forms of cnidarians are polyp and medusa.
Free-Swimming Species
- Some free-swimming Cubozoa and Scyphozoa species have a characteristic of being bioluminescent, producing their own light.
Coordination of Activities
- The activities of cnidarians are coordinated by a network of nerve cells, known as a nerve net, which is spread throughout their bodies.
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