5 Questions
What is the distinguishing feature of cnidarians?
Decentralized nervous system and cnidocytes
What is the composition of cnidarians' bodies?
Mesoglea sandwiched between two layers of epithelium
What are the two basic body forms of cnidarians?
Swimming medusae and sessile polyps
What is a characteristic of some free-swimming Cubozoa and Scyphozoa species?
Possession of balance-sensing statocysts and simple eyes
How are the activities of cnidarians coordinated?
By a decentralized nerve net and simple receptors
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.
Test your knowledge of Cnidaria with this quiz! Explore the characteristics and diversity of this fascinating phylum, which includes jellyfish, corals, and sea anemones. See how much you know about these aquatic animals and their unique features.
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