biology test 3 vocabualry

biology test 3 vocabualry - 1. Larva: A free-living,...

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1. Larva: A free-living, sexually immature form in some animal life cycles that may differ from the adult in morphology, nutrition, and habitat. 2. Metamorphosis: The transformation of a larva into an adult. 3. Colonial Aggregate: 4. Invertebrate: An animal that lacks a backbone. 5. Vertebrate: A chordate animal with a backbone. Vertebrates include lampreys, chondricthyans, ray-finned fishes, lobe-finned fish, amphibans, reptiles (including birds), and mammals. 6. Bilateral Symmetry: An arrangement of body parts such that an organism can be divided equally by a single cut passing longitudally through it. A bilaterally symmertrical organism has mirror-image right and left sides. 7. Radial Symmetry: An arrangement of the body parts of an organism like pieces of a pie around an imaginary central axis. Any slice passing longitudinally through a radically symmetrical organism’s central axis divides it into mirror- image halves. 8. Coelom: A body cavity completely lined with mesoderm. 9. Pseudocoelom: A body cavity that is in direct contach with the wall of the digestive tract. 10. Cephalization: The concentration of a nervous system at the anterior (head) end. 11. 2-ended Gut: 12. Sac-like Gut: 13. Segmentation: Subdivision along the length of an animal body into a series of repeated parts called segements. 14. Porifera: The body of a spinge resembles a trhich-walled sac perforated with holes. (porifera means “pore-bearer” in Latin.) Water is drawn through the pores into a centrqal cavity, then flows out through a large opening. 15. Platyhelminthes: Flatworms, phylum Platyheliminthes (from the Greek platys , flat, helmis , worm), are the simplest of the bilaterians. 16. Mollusca: A soft-bodied animal characterized by a muscflar foot, mantle, mantle cavity, and radula; includes gastropods (snails and slugs), bivalbes (clams, oysters, and scallops), and cephalopods (squids and octopuses). 17. Anthropoda: 18. Cnidaria: An animal characterized by cnidocytes, radical symmetry, a gastrovascular cavity, and a polyp and medusa. Cnidarians include the hydras, jellyfishes, sea aneomones, corals, and related animals. 19. Nematoda: A roundworm, characterized by a pseudocoelom, a cylindrical, wormlike body form, and a tough cuticle. 20. Annelida: A segmented body resembling a series of fused rings is the hallmark of phylum Annelida (from the Latin annelus , ring). 21. Echinodermata: Member of a phylum of slow-moving or sessile marine animals characterized by a rough or spiny skin, a water vascular system. An endoskeleton, and radical summetry in adults. Echinoderms including sea stars, sea urchins, and sand dollars. 22. Choanocyte: A flagellated feeding cell found in sponges. Also called a collar cell’ it has a collar-like ring that traps food paticles around the base of flageillum.
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23. Amoebocyte: An amoeba-like cell that moves by pseudopodia, found in most aminals; depending on the species, may digest and distrubute food, dispose of wase, form skeletal fibers, fight infections, and change into other cell types. 24. Cnidocyte:
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biology test 3 vocabualry - 1. Larva: A free-living,...

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