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21 Cards in this Set
- Front
- Back
What level of biological organization do cnidarians have?
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Tissue
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What type of symmetry do Cnidarians have? What advantage does this have
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Radial- sensory distribution on all side
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List and define the 3 tissue layers of Cnidarians.
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Epidermis
Mesoglea Gastrodermis |
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Cnidocytes
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stinging structures in tentacles, whole structure
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Cnida
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contains a coiled, hollow, usually barbed thread, CAPSULE
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Nematocyst
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A capsule within specialized cells of certain coelenterates, such as jellyfish, containing a barbed, threadlike tube that delivers a paralyzing sting when propelled into attackers and prey. Also called stinging cell. BARBED THREAD
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Cnidocil
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a hairlike sensory process projecting from the surface of a cnidoblast, believed to trigger the discharge ofthe nematocyst.
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What type of larvae do all cnidarians produce?
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Planula
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Briefly describe the sensory system of Cnidarians
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Lack brain, have nerve cells that connect to create nerve net which transmits impulses, Statocysts- sense of balance
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Define alternation of generations and provide an example from within the Phylum Cnidaria, being sure to list the name and type of reproduction within each stage.
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Male & Female brodacast sperm- creates embryo-planula-young colony- reproductive release medusae
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List the 4 classes of Cnidarians
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Hydrozoans
Anthozoans scyphozoa cubozoa |
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What anatomical aspect distinguishes Class Anthozoa from other cnidarians?
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Septa- thin partion allowing for larger polyps, digestion of larger prey
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List the 4 different reproductive strategies found within Class Anthozoa
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-Fission
-Pinching -Budding - Pedal Laceration |
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What are acrorhagi?
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Fighting tentacles found in Anthozoa
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List 4 ecological roles of Cnidarians, providing an example for each.
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Prey
Predator Biogenic Habitats Symbiosis -Zooxanthellae & coral |
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Symbiotic
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A close, prolonged association between two or more different organisms of different species that may, but does not necessarily, benefit each member.
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Commensalism
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one organism benefits without affecting the other
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Parasitism
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one organism, the parasite, benefits at the expense of the other, the host
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obligate mutualism
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interdependent with one another in a way that one cannot survive without the other
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Facultative mutualism
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derive benefit from each other but not being fully dependent that each cannot survive without the symbiotic partner
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Provide 3 examples of mutualism within the Cnidarian phylum, listing each of the two partners and how they benefit.
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Hermatypic corals (the ones that form coral reefs) have symbiotic zooxanthellae (unicellular algae) within their tissues; the algae receive protection and housing from the polyps, and enable them to produce their calcareous exoskeleton.
There are sea anemones that attach to the dorsum of crabs, marine snails, etc. Thus the anemone "travels free" and the other animal is protected. Many species of small fishes and crustaceans shelter beneath the umbella of some jellyfish (read example at the link). |