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Chapter 16: Invertebrates

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  • The inside walls of sponges contain what structure for support?
    Spicules
  • Sponges are in the Phylum_____________
    Porifera
  • This germ layer develops into digestive organs
    Endoderm
  • Sponges contain what type of symmetry?
    asymmetric
  • The outer most ectoderm layer of worms contain lots of sensory organs that send information to what group of nerve cells?
    ganglia
  • Which types of worms can be parasitic?
    all
  • These species retain eggs inside the mother's body(not directly attached)
    Ovoviviparous
  • This type of symmetry divides the body into two equal parts through the centerline
    Bilateral Symmetry
  • Sea anemones are in what phylum?
    Cnidarians
  • How do most worms exchange air to breathe?
    Through their ectoderm(skin)
  • What is the large opening called at the top of all sponges?
    osculum
  • A "U" shaped cnidarian is called....
    Polyp
  • These type of animals do not have the ability to regulate an internal body temperature
    ectothermic
  • Hermaphrodites means.....
    Having both male and female reproductive organs
  • What does the term Exoskeleton mean?
    An external support structure for the body
  • An animal that requires a host to survive.
    a parasite
  • Nematodes are what types of worms?
    roundworms
  • This germ layer develops into skin and nervous system
    Ectoderm
  • After fertilization animals begin to develop, what is the hollow ball of cells called that form at the early stage of development?
    The Blastula
  • The term invertebrates means ...
    not containing a backbone
  • What does the term Endoskeleton mean?
    An internal support structure for the body
  • True or False: Jellyfish exhibit Cephalization
    False
  • What is cephalization?
    A concentration of sensory organs at one end of the body (a true brain)
  • These species lay eggs that hatch outside the mother's body
    Oviparous
  • Some animals are mobile, and some animals are _________ .
    Sessile (immobile)
  • These type of animals do have the ability to regulate an internal body temperature
    Endothermic
  • These species give birth to live young
    Viviparous
  • What does asymmetrical symmetry mean?
    The body plan of an animal that allows multiple planes through a center point
  • What are the three main types of skeletal structures in animals?
    Hydroskeleton, Endoskeleton, Exoskeleton
  • What two characteristics allow sponges to be considered living?
    Multicellular eukaryotic cells, ability to reproduce
  • What type of cells allow sponges to digest food?
    Collar cells
  • All animals have an organ that help exchange of gas for ___________________
    Respiration
  • All animals must obtain nutrition from other organisms because they are __________________.
    Heterotrophs
  • This germ layer develops into muscles
    Mesoderm
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