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Questions and Answers
What is the larval stage called that develops after fertilization in Cnidaria?
What is the larval stage called that develops after fertilization in Cnidaria?
Which class of Cnidaria primarily consists of polyps and has a brief medusoid life stage?
Which class of Cnidaria primarily consists of polyps and has a brief medusoid life stage?
What type of reproduction can occur in members of the class Anthozoa?
What type of reproduction can occur in members of the class Anthozoa?
What characteristic is unique to the class Cubozoa compared to other classes of Cnidaria?
What characteristic is unique to the class Cubozoa compared to other classes of Cnidaria?
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What is the function of ocelli found in Scyphozoa?
What is the function of ocelli found in Scyphozoa?
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Which member of the Hydrozoa class is known for its ability to live in both oceans and freshwater?
Which member of the Hydrozoa class is known for its ability to live in both oceans and freshwater?
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What kind of skeleton do Anthozoa have?
What kind of skeleton do Anthozoa have?
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What is the main method of feeding for Hydrozoa?
What is the main method of feeding for Hydrozoa?
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What is the main mode of reproduction in cnidarians?
What is the main mode of reproduction in cnidarians?
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What type of symmetry do cnidarians exhibit?
What type of symmetry do cnidarians exhibit?
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What is the function of the nematocysts found in cnidarians?
What is the function of the nematocysts found in cnidarians?
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Which of the following statements about cnidarian forms is true?
Which of the following statements about cnidarian forms is true?
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In what type of environments do cnidarians primarily live?
In what type of environments do cnidarians primarily live?
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What is the arrangement of cells in cnidarians referred to as?
What is the arrangement of cells in cnidarians referred to as?
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Which structure in cnidarians serves both as a mouth and an anus?
Which structure in cnidarians serves both as a mouth and an anus?
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What type of nervous system do cnidarians possess?
What type of nervous system do cnidarians possess?
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Study Notes
Phylum Cnidaria
- Belong to the oldest animal groups on Earth
- Diploblastic, with two germ layers: endoderm and ectoderm
- Jelly-like mesoglea between these layers
- Radial symmetry
- Aquatic, mostly marine
- Tissue-level organization; cells create tissues
- Gastrovascular cavity, with a single opening (mouth/anus)
- Tentacles surrounding the mouth region, with stinging cells (nematocysts)
- Can sting humans, sometimes causing a painful wound
- Breathing through the whole surface of the body
- Nerve net nervous system
- Two forms: polyp (sessile) and medusa (free-swimming)
- Alternation of generations (polyp and medusa stages)
Hydrozoa
- Polyps with a brief medusa stage
- Huge regenerative capacity
- Filter feeders (feed on plankton)
- Some have a velum (circular shelf)
- Examples: hydra, freshwater jellyfish (Craspedacusta sowerbyi)
Cubozoa
- Cube-shaped medusa
- Long tentacles
- Very dangerous venom, potentially fatal to humans
- Tropical ocean dwellers
Scyphozoa
- Primarily medusa-form
- Have a brief polyp stage
- Sexual reproduction (planula and strobilation)
- Ocelli (light-sensitive organs)
- Example: Common jellyfish (Aurelia aurita)
Anthozoa
- No medusa stage
- Sexual and asexual reproduction (budding)
- Internal skeleton of needles (mesoglea)
- External skeletons that form coral reefs and atolls
- Examples: stony corals, brain coral, sea anemones, red coral
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Description
This quiz covers the characteristics and classifications of Phylum Cnidaria, one of the oldest animal groups on Earth. Learn about their unique structures, functions, and the different classes such as Hydrozoa and Cubozoa. Explore their reproductive strategies and ecological significance.
