Practice Questions on Chapter 1

  1. What phylum do vertebrates belong to?
    Arthropoda
    Chordata
    Echinodermata
    Hemichordata
    Mollusca

  2. Which two groups include the vertebrates?
    Archea and Bilateria
    Archea and Radiata
    Bilateria and Platyzoa
    Eukaryota and Deuterostomia
    Eukaryota and Platyzoa

  3. What defines the Eumetazoa?
    Bilateral symmetry
    Eukaryotic cells
    Specialized tissues and organs
    The blastopore becomes the anus
    The blastopore becomes the mouth

  4. What defines the Deuterostomia?
    Bilateral symmetry
    Eukaryotic cells
    Specialized tissues and organs
    The blastopore becomes the anus
    The blastopore becomes the mouth

  5. Which of the successful and diverse animal phyla are the Chordates mostly closely related to?
    Annelids
    Arthropods
    Brachiopods
    Echinoderms
    Molluscs

  6. Match each animal with the group of chordates or chordate relatives that it belongs to.
    Acorn worms
    Carpoids
    Conodonts
    Craniates
    Jawless fishes
    Lancelets
    Pterobranchs
    Sand dollars
    Sea squirts
    Star fishes
    Cephalochordata
    Echinodermata
    Hemichordata
    Urochordata
    Vertebrata

  7. Which group of Chordate or chordate relative have a sessile adult stage (attached and immobile)?
    Acorn worms
    Conodonts
    Lancelets
    Pterobranchs
    Sea squirts

  8. What is paedogenesis?
    An evolutionary innovation
    An evolutionary reversal
    Conversion of bacteria into organelles of eukaryotes
    Conversion of larval form into a reproductive adult
    Retention of juvenile traits into adulthood

  9. What proposed conversion in chordate history is a case of paedogenesis?
    Cephalochordate > Urochordate
    Cephalochordate > Vertebrate
    Hemichordate > Cephalochordate
    Urochordate > Cephalochordate
    Urochordate > Hemichordate

  10. When do Chordates appear in the fossil record compared to other successful phyla such as Arthropods, Echinoderms, and Mollusks?
    At almost exactly the same time
    Long after
    Long before
    Shortly after
    Shortly before

  11. What is the location of the Chengjiang Fauna?
    British Columbia
    China
    England
    India
    Russia

  12. What is the age of the Chengjiang Fauna?
    Early Cambrian
    Early Ordovician
    Late Cambrian
    Late Precambrian
    Middle Cambrian

  13. What Chordates have been identified from the Chengjiang Fauna?
    None, only hemichordates and echinoderms
    Only Cephalochordates
    Only Urochordates
    Only Urochordates and Cephalochordates
    Vertebrates and other Chordates

  14. What are the two key characters used to identify a Chordate?
    Digestive track and circulatory system
    Dorsal hollow nerve cord and notochord
    Muscle segments and post-anal tail
    Specialized sense organs and three-part brain
    Stomochord and large nerve cells

  15. What are the two key characters used to identify a Vertebrate?
    Digestive track and circulatory system
    Dorsal hollow nerve cord and notochord
    Muscle segments and post-anal tail
    Specialized sense organs and three-part brain
    Stomochord and large nerve cells

  16. What is the Cambrian Explosion and what is its significance?