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Questions and Answers
What is radial symmetry?
What is radial symmetry?
1
What are nematocysts found on tentacles?
What are nematocysts found on tentacles?
2
Cnidarians use both asexual and sexual reproduction.
Cnidarians use both asexual and sexual reproduction.
True (A)
What is the gastrovascular cavity used for?
What is the gastrovascular cavity used for?
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What are the three main body plans of cnidarians?
What are the three main body plans of cnidarians?
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Cnidarians are vertebrates.
Cnidarians are vertebrates.
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Study Notes
Characteristics of Cnidarians
- Radial symmetry allows for a circular body plan, enabling equal distribution of body parts around a central axis.
- Nematocysts are specialized cells located on tentacles used for capturing prey and defense; they contain stinging organelles that can inject toxins.
- Reproduction in cnidarians can be both asexual, through budding or fragmentation, and sexual, involving gamete production and fertilization.
- The gastrovascular cavity serves as both a digestive and circulatory system, where food is ingested, digested, and nutrients are distributed throughout the organism.
- Cnidarians exhibit three main body plans: polyp (sessile form), colonial polyp (integrated group of polyps), and medusa (free-swimming form).
- Cnidarians are classified as invertebrates, meaning they lack a backbone, which distinguishes them from vertebrate animals.
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