Biology 121

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Author:
Brandon47
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120783
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Biology 121
Updated:
2011-12-07 22:08:01
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Chapter 23
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Chapter 23
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  1. What are the key features of animals?
    • - Multicellular
    • - Heterotrophic
    • - Typically reproduce sexually
    • - Cells lack a cell wall
    • - Are motile
    • - Most are able to repond rapidly to external stimuli
  2. Lack of tissues separates _______ from all other animals.
    sponges
  3. A body plan in which any plane along a central axis will divide the body into approximately mirror-image halves.
    Radially symmetrical
  4. A body plan in which only a single plane through the central axis will divide the body into mirror-image halves.
    Bilateral symmetry
  5. A form of development in which the body cavity forms within space between body wall & digestive cavity: annelids, arthropods, molluscs.
    -Head develops first.
    Protostome development
  6. A form of development in which the body cavity forms as an outgrowth of digestive cavity: echinoderms, chordates.
    -Anus develops first.
    Deuterostome development
  7. _______are found in most marine and aquatic enviroments.
    Sponges
  8. Sponges may reproduce asexually by________, in which the adult produces miniature versions of itself that drop off and assume an independent existence.
    budding
  9. _______are well-armed predators. Have two basic body plans-polyp and medusa, distinctive tissues,Cnidocytes, Gastrovascular cavity, and are important to the coral reefs.
    Cnidarians
  10. The polyp form of Cnidarians is seen....?
    - In hydra, sea anemones, and the individual polyps within a coral.
  11. The medusa form of Cnidarians is seen....?
    - In the jellyfish, resmbles an inverted polyp.
  12. ________ have organs but lack respiratory and circulatory systems.
    Flatworms
  13. The bodies of _______ are divided into a series of similar repeatign segments.
    Annelids
  14. Is advantageous for locomotion, because the body compartments are each contolled by seperate muscles and collectively are capable of more complex movement than could be achieved with only one set of muscles to control the whole body.
    Segmentation
  15. A __________ annelid projects brightly spiraling gills from a tube attached to rock. When the gills retract, the tube is covered by the trap door.
    Polychaete
  16. The ________ _________ swims by using paddles on each segment. The bristles on each paddle can deliver a fiery sting.
    "fireworm" polychaete
  17. A ________ is a freshwater annelid with numerous segments. The sucker encircles its mouth, allowing it to attach to its prey.
    - Leech
  18. Characteristics of most mollusks.....
    • - Most have shells
    • - Open circulation
    • - Gastropods are one-footed crawlers
    • *Radula
    • *Gas exchange via skin or simple lung
  19. ______ are Marine predators, have closed circulatory systems, and have highly developed brains and sensory structures.
    Cephalopods
  20. An ________ can crawl rapidly by using its eight suckered tentacles, and can alter its color and skin texture to blend with its surroundings.
    Octopus
  21. A ______ moves entirely by contracting its mantle to generate jet propulsion, which pushes the animal backward through the water.
    Squid
  22. The chambered _______ secretes a shell with internal, gas-filled chambers that provide buoyancy. Has well-developed eyes and tentacles used to capture prey.
    Nautilus
  23. _______ are the dominant animals on earth. Their exoskeletons require molting, segmentation, Gas exchange - gills, tracheae, or book lungs, and have open circulatorty systems.
    Arthropods
  24. ________ are the only flying invertebrates.
    Insects
  25. Most _________ are predatory meat eaters.
    Arachnids
  26. _________ have many legs.
    Myriapods
  27. Most _________ are aquatic.
    crustaceans
  28. An __________ allows precise movements and must be molted periodically.
    exoskeleton
  29. ________ possess compound eyes.
    Arthropods
  30. Characteristics of roundworms....
    • - They are abundant and mostly tiny
    • - Tubular gut
    • - Pseudocoelom
    • - Molting
    • - Parasites
  31. _________ have a calcium carbonate skeleton.
    Echinoderms

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