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Chordates (Grade 10)

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The earliest organisms to arise on Earth were the chordates.
  1. True
  2. False
Which characteristic is shared by all members of the phylum Chordata?
  1. lobed fins
  2. colored hair
  3. downy feathers
  4. post-anal tail
What are the two groups of nonvertebrate chordates?

Which classes belong within the phylum Chordata? Select all that apply.
  1. Pisces
  2. Aves
  3. Decapoda
  4. Mammalia
  5. Asteroidea
During development of many vertebrates, the                          becomes the spinal cord.
Which is an adaptation that has allowed members of the phylum Chordata to reproduce on land?
  1. development of the amniotic egg
  2. being able to have multiple births per year
  3. maintaining a constant internal body temperature
  4. producing toxic chemicals that serve as defense
The group of chordates that is most closely related to the now-extinct dinosaurs are the
  1. fish.
  2. mammals.
  3. reptiles.
  4. birds.
In Chordates, the central nervous system arises from the                                                         .
In humans, the post-anal tail is completely lost.
  1. True
  2. False
All chordates have pharyngeal slits. In some members of this phylum, they become gills. Since primates are also chordates, this means that humans also have them. What would you say to someone who is arguing with you about whether or not humans have gills?

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