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5.8.12: Review Questions

  • Page ID
    98198
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    4.

    Mesohyl contains:

    1. a polysaccharide gel and dead cells.
    2. a collagen-like gel and suspended cells for various functions.
    3. spicules composed of silica or calcium carbonate.
    4. multiple pores.
    5.

    The large central opening in the parazoan body is called the:

    1. gemmule.
    2. spicule.
    3. ostia.
    4. osculum.
    6.

    Most sponge body plans are slight variations on a simple tube-within-a-tube design. Which of the following is a key limitation of sponge body plans?

    1. Sponges lack the specialized cell types needed to produce more complex body plans.
    2. The reliance on osmosis/diffusion requires a design that maximizes the surface area to volume ratio of the sponge.
    3. Choanocytes must be protected from the hostile exterior environment.
    4. Spongin cannot support heavy bodies.
    7.

    Cnidocytes are found in _____.

    1. phylum Porifera
    2. phylum Nemertea
    3. phylum Nematoda
    4. phylum Cnidaria
    8.

    Cubozoans are ________.

    1. polyps
    2. medusoids
    3. polymorphs
    4. sponges
    9.

    While collecting specimens, a marine biologist finds a sessile Cnidarian. The medusas that bud from it swim by contracting a ring of muscle in their bells. To which class does this specimen belong?

    1. Class Hydrozoa
    2. Class Cubozoa
    3. Class Scyphozoa
    4. Class Anthozoa
    10.

    Which group of flatworms are primarily ectoparasites of fish?

    1. monogeneans
    2. trematodes
    3. cestodes
    4. turbellarians
    11.

    The rhynchocoel is a ________.

    1. circulatory system
    2. fluid-filled cavity
    3. primitive excretory system
    4. proboscis
    12.

    Annelids have (a):

    1. pseudocoelom.
    2. true coelom.
    3. no coelom.
    4. none of the above
    13.

    A mantle and mantle cavity are present in:

    1. phylum Echinodermata.
    2. phylum Adversoidea.
    3. phylum Mollusca.
    4. phylum Nemertea.
    14.

    How does segmentation enhance annelid locomotion?

    1. Segmentation creates repeating body structures so the entire organism functions in synchrony.
    2. Segmentation allows specialization of different body regions.
    3. Neural segmentation allows annelids to localize sensations.
    4. Muscle contractions can be localized to specific regions of the body to coordinate movement.
    15.

    The embryonic development in nematodes can have up to __________ larval stages.

    1. one
    2. two
    3. three
    4. four
    16.

    The nematode cuticle contains _____.

    1. glucose
    2. skin cells
    3. chitin
    4. nerve cells
    17.

    Crustaceans are _____.

    1. ecdysozoans
    2. nematodes
    3. arachnids
    4. parazoans
    18.

    Flies are_______.

    1. chelicerates
    2. hexapods
    3. arachnids
    4. crustaceans
    19.

    Which of the following is not a key advantage provided by the exoskeleton of terrestrial arthropods?

    1. Prevents dessication
    2. Protects internal tissue
    3. Provides mechanical support
    4. Grows with the arthropod throughout its life
    20.

    Echinoderms have _____.

    1. triangular symmetry
    2. radial symmetry
    3. hexagonal symmetry
    4. pentaradial symmetry
    21.

    The circulatory fluid in echinoderms is _____.

    1. blood
    2. mesohyl
    3. water
    4. saline
    22.

    Which of the following features does not distinguish humans as a member of phylum Chordata?

    1. Human embryos undergo indeterminate cleavage.
    2. A spinal cord runs along an adult human’s dorsal side.
    3. Human embryos exhibit pharyngeal arches and gill slits.
    4. The human coccyx forms from an embryonic tail.
    23.

    The sister taxon of the Chordata is the _____.

    1. Mollusca
    2. Arthropoda
    3. Ambulacraria
    4. Rotifera

    5.8.12: Review Questions is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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