Questions and Answers
What are the three classes of Phylum Cnidaria?
What helps cnidarians move?
Neutral net
What is a defense shared by porifera and cnidarians?
Biotoxins
What is the benthic cnidarian form called?
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What is the pelagic cnidarian form called?
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What is a body called with only 2 layers of tissue?
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What do all cnidarians use to catch prey?
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What is the tissue lining the gut cavity called?
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What is the name of the attachment point to the substrate in anemones?
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What type of symmetry is seen in cnidarians?
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What is the name of the cell that houses the nematocyst?
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What type of cue will cause a cnidocyte to fire a nematocyst?
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What keeps a nematocyst barb from pulling out of the prey?
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What type of asexual reproduction do cnidarians have?
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What method of sexual reproduction do cnidarians use?
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In which class are the jellyfish?
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Hydroids are (choose one): Solitary only, colonial only, or both solitary and colonial?
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What type of Hydrozoan polyp is responsible for reproduction?
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What does the term 'zooid' mean?
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What is the name of the air-filled polyp of a bluebottle colony?
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What is the name of the larva seen in both Cnidaria and Porifera?
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What is the name of the non-living substance in the bell of a jellyfish?
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What type of cells line the inside of a statocyst?
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What structure helps a jellyfish know which way is up?
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Which swims, an ephyra or a strobilia?
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What are the two subclasses of class Anthozoa?
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What is the subclass of soft corals called?
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What does the term or prefix, 'scler' mean?
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Which class of Cnidaria never has a medusa stage?
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Which type of Actinaria generally feed at night?
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Which type of Actinaria generally feed during the day?
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What is the hard shell of a coral colony called?
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What are the membranes that separate segments of the polyp?
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How can you determine the age of certain hard corals?
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What do zooxanthellae get from living in coral? (3 things)
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What do corals get from zooxanthellae? (2 things)
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Is coral bleaching always fatal to the coral?
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Sea anemones belong to the Cnidarian class...
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What body form is dominant in the scyphozoa?
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The benthic strobilia form is seen in the life cycle of the class...
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Study Notes
Classes of Cnidaria
- Three major classes include Hydrozoa (hydroids), Anthozoa (soft and hard corals, sea anemones), and Scyphozoa (jellyfish).
Movement and Defense
- Cnidarians move through a neutral net structure.
- Biotoxins serve as a common defense mechanism shared with Porifera.
Forms and Symmetry
- Benthic form: Polyp.
- Pelagic form: Medusa.
- Cnidarians exhibit radial symmetry.
Tissue Structure
- Cnidarians have diploblastic bodies composed of two tissue layers.
- The gut cavity is lined with endoderm.
Feeding Mechanism
- Prey capture is facilitated by specialized stinging cells called cnidocytes.
Reproductive Strategy
- Asexual reproduction occurs via budding.
- Sexual reproduction typically involves broadcast spawning.
Classification Details
- Jellyfish belong to the class Scyphozoa.
- Hydroids can exist as both solitary and colonial organisms.
- Gonozooids are responsible for reproduction in Hydrozoans.
- The life cycle of Scyphozoa includes a benthic strobilia form.
Structures and Functions
- The attachment point for anemones: stolon or pedal disc.
- Nematocysts are housed within specialized cells called cnidocytes.
- Triggering of nematocysts occurs via chemical and physical cues.
Complex Structures
- Nematocyst barbs are secured in prey by backward-facing projections.
- Statocysts help jellyfish orient themselves by detecting gravity.
Coral and Environment
- Two subclasses of Anthozoa: Zoantharia (includes Actinaria for anemones and Scleractinaria for hard corals) and Octocoralia (soft corals).
- Zooxanthellae obtain nutrients, protection, and buoyancy from corals, while corals receive sugars and coloration in return.
Coral Health
- Coral bleaching is not always fatal; recovery is possible if conditions allow for re-inoculation.
Additional Notes
- The hard shell of a coral colony is referred to as the theca or corallite.
- The membranes that divide polyp segments are known as septa.
- Age determination in hard corals can be performed by examining concentric rings similar to tree rings.
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Description
Test your knowledge of Phylum Cnidaria, which includes fascinating creatures like anemones, jellyfish, hydroids, and corals. This quiz covers key classes, movement mechanisms, and defense strategies of these marine animals. Perfect for biology students looking to reinforce their understanding of this diverse phylum.
