Mollusca E-worksheet Test

30 Questions | Total Attempts: 83

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Mollusca E-worksheet Test

Welcome to the 21st Century electrononic biology classroom. The phylum Mollusca is a very diverse group of more than 112,000 species. Some mollusks are sedentary filter feeders, while other are fast-moving predators with complex nervous system. You will be dealing mainly with the class Bivalvia (clams). Remember, when entering your answers they are lower case sensitive. The test will allow unlimited number of attempts in assisting you to develop better learning and test-taking skills. You will be given 25 random questions for every attempt. Good Luck!


Questions and Answers
  • 1. 
    The visceral mass of a mollusk is covered by a layer of epidermis called a(n)_____.
    • A. 

      Anterior Adductor Muscles

    • B. 

      Mantle

    • C. 

      Visceral Muscle

    • D. 

      Shell

    • E. 

      Hemocoel

  • 2. 
    _____ is the fluid in an open circulatory system.
  • 3. 
    What are hemolymph-filled spaces in the tissues of an animal with an open circulatory system called a(n)_____?
    • A. 

      Visceral Mass

    • B. 

      Incurrent siphon

    • C. 

      Hemolymph

    • D. 

      Hemocoel

    • E. 

      Body Cavity

  • 4. 
    A _____ _____ of a bivale takes in water that contains oxygen and nutrients.
  • 5. 
    The ventral siphon carries wastes from the mollusks body.
    • A. 

      True

    • B. 

      False

  • 6. 
    One feature that is shared by many mollusks and annelids is the_____.
    • A. 

      Radula

    • B. 

      Mantle cavity

    • C. 

      Trochophore

    • D. 

      Pseudopodium

    • E. 

      Endoskeleton

  • 7. 
    Mollusks in the class Gastropoda:
    • A. 

      Lacks a distinct head

    • B. 

      Have an open circulatory system

    • C. 

      Don't have a hemocoel

    • D. 

      Are usually sessile

  • 8. 
    Bivalves have all of the following structures except______.
    • A. 

      Adductor muscles

    • B. 

      Gills

    • C. 

      Labial Palps

    • D. 

      Siphons

    • E. 

      Radula

  • 9. 
    An octopus generally moves through the water by which method.
    • A. 

      Jet of water

    • B. 

      Jet of air

    • C. 

      Crawling with tentacles

    • D. 

      Gliding on mucus

    • E. 

      Opening valves

  • 10. 
    Identify the two main regions of a typical mollusks's body?
    • A. 

      Mantle and Shell

    • B. 

      Head and foot

    • C. 

      Visceral mass

    • D. 

      Siphons

    • E. 

      Head-stomach

  • 11. 
    Which region of a typical mollusks contains most of the internal organs?
  • 12. 
    What is the usual function of the mantle in a clam or snail?
    • A. 

      Feeding

    • B. 

      Protection

    • C. 

      Respiration

    • D. 

      Reproduction

    • E. 

      Locomotion

  • 13. 
    What is the feeding methods of  gastropods?
    • A. 

      Filter Feeder

    • B. 

      Radula

    • C. 

      Tentacles

    • D. 

      Digestive Enzymes

  • 14. 
    Marine clams shed eggs and sperm into the water, and fertilization occurs externally.
    • A. 

      True

    • B. 

      False

  • 15. 
    Mollusks and annelids are two phyla that have a coelom.  Another feature shared by many mollusks and annelids is the larval stage called a(n)_____.
  • 16. 
    Mollusks have many organ systems, which are contained in the _____ _____.
    • A. 

      Class Bivalvia

    • B. 

      Mantle Shell

    • C. 

      Visceral Mass

    • D. 

      Class Gastropoda

  • 17. 
    A fleshy layer of epidermis called the _____ secretes the shell.
  • 18. 
    All mollusks, except bivalves, have a tonguelike organ called a(n)_____.
    • A. 

      Intestine

    • B. 

      Gill

    • C. 

      Heart

    • D. 

      Radula

    • E. 

      Incurrent Siphon

  • 19. 
    Bilateral symmetry is apparent in the nervous system, which has paired clusters of nerve cells called a(n)_____.
  • 20. 
    _____ that have snails and slugs are primarily a marine group that has also successfully invaded freshwater and terrestrial habitats.
    • A. 

      Cephapods

    • B. 

      Gastropods

    • C. 

      Blastula

    • D. 

      Ectoderm

  • 21. 
    The cilia on the gills of a bivalve draw in sea water through hollow tubes called a(n)_____ _____.
    • A. 

      Excurrent siphon

    • B. 

      Meosderm siphon

    • C. 

      Incurrent siphon

    • D. 

      Excurrent jets

    • E. 

      Endoderm siphon

  • 22. 
    What order are marine clams found?
    • A. 

      Animalia

    • B. 

      Mollusca

    • C. 

      Pelecypoda

    • D. 

      Venus

    • E. 

      Eulamellibranchia

  • 23. 
    Incurrent and excurrent siphons are visible from an external view.
    • A. 

      True

    • B. 

      False

  • 24. 
    Where are the youngest growth rings found on a clam?
    • A. 

      Near the umbo

    • B. 

      Edge of the shell

    • C. 

      Away from the umbo

    • D. 

      Age can not be determined

    • E. 

      Measure the foot sizek

  • 25. 
    The inner surface of the left valve of a clam contains cardinal teeth.
    • A. 

      True

    • B. 

      False