Nematoda and Flatworms Quiz
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Questions and Answers

What is the body structure of Nematoda?

  • Cylindrical and unsegmented (correct)
  • Segmentation
  • Irregular shape
  • Flat and segmented

    • All nematodes are parasitic and cannot live freely.

    False

    Name one example of a nematode that is known to be a human parasite.

    Ascaris lumbricoides

    Nematodes are classified as ___ due to their body cavity structure.

    <p>pseudocoelomates</p> Signup and view all the answers

    Match the following classes of Nematoda with their features:

    <p>Chromadorea = Amphids are pore-like/slit-like Enoplea = Amphids are pocket-like for smell</p> Signup and view all the answers

    What type of symmetry do nematodes exhibit?

    <p>Bilateral symmetry</p> Signup and view all the answers

    What is the function of a stylet in nematodes?

    <p>Piercing mouthpart for feeding and secretion</p> Signup and view all the answers

    Which class of flatworms is characterized by being free-living?

    <p>Class Turbellaria</p> Signup and view all the answers

    Flatworms exhibit radial symmetry.

    <p>False</p> Signup and view all the answers

    What type of digestive system do flatworms possess?

    <p>incomplete digestive system</p> Signup and view all the answers

    The first multicellular organism with a fully sequenced genome is _.

    <p>C. elegans</p> Signup and view all the answers

    Match the following diseases with their causative agents:

    <p>Filariasis = Wuchereria bancrofti Ascariasis = Ascaris lumbricoides Trichinosis = Trichinella spiralis Schistosomiasis = Schistosoma mansoni</p> Signup and view all the answers

    What is the primary function of flame cells in the excretory system of flatworms?

    <p>Fluid waste removal</p> Signup and view all the answers

    What is a common characteristic of the reproductive system in flatworms?

    <p>mostly monoecious, hermaphroditic</p> Signup and view all the answers

    Parasitic nematodes have a complex life cycle involving intermediate and definitive hosts.

    <p>True</p> Signup and view all the answers

    Parasitic flatworms belong to the class _.

    <p>Monogenea</p> Signup and view all the answers

    Which class of mollusks is characterized by having a cap-shaped shell and typically inhabits deep-water environments?

    <p>Class Monoplacophora</p> Signup and view all the answers

    All arthropods have a closed circulatory system.

    <p>False</p> Signup and view all the answers

    What feature distinguishes Class Bivalvia from other classes of mollusks?

    <p>Two shells and no head.</p> Signup and view all the answers

    The __________ is the basic larval stage found in many mollusks.

    <p>trochophore</p> Signup and view all the answers

    Match the following classes of mollusks to their characteristics:

    <p>Class Gastropoda = Univalve, torsion causes visceral asymmetry Class Cephalopoda = Head with tentacles, jet propulsion Class Polyplacophora = Eight dorsal plates Class Bivalvia = Two shells, filter feeders</p> Signup and view all the answers

    What is the primary method by which tapeworms absorb nutrients from their host?

    <p>By using hooks and suckers</p> Signup and view all the answers

    The tapeworm lifecycle only involves definitive hosts, which are typically humans.

    <p>False</p> Signup and view all the answers

    What are two examples of species that belong to the Taenia genus?

    <p>Taenia solium and Taenia saginata</p> Signup and view all the answers

    Schistosomiasis is caused by the _____ species.

    <p>Schistosoma</p> Signup and view all the answers

    Match the parasitic diseases to their corresponding symptoms:

    <p>Schistosomiasis = Abdominal pain, diarrhea, blood in urine or stool Taeniasis = Abdominal pain, nutrient deficiency</p> Signup and view all the answers

    What practical measure can help prevent schistosomiasis?

    <p>Using molluscicides</p> Signup and view all the answers

    Tapeworms have a well-developed digestive system to process food.

    <p>False</p> Signup and view all the answers

    What is the treatment for schistosomiasis?

    <p>Praziquantel</p> Signup and view all the answers

    Annelids have a _____ circulatory system that is closed.

    <p>closed</p> Signup and view all the answers

    Which of the following structures are found in the Class Cestoda?

    <p>Scolex</p> Signup and view all the answers

    Which of the following is a characteristic of the class Polychaeta?

    <p>Free-living or tube-dwelling</p> Signup and view all the answers

    Earthworms have a clitellum which is used for mucus secretion during reproduction.

    <p>True</p> Signup and view all the answers

    What is the primary role of nephridia in the excretory system of annelids?

    <p>To collect and expel wastes.</p> Signup and view all the answers

    The __________ is a dorsal epithelium that secretes the shell in mollusks.

    <p>mantle</p> Signup and view all the answers

    Match the class of annelids to its characteristic:

    <p>Class Polychaeta = Largest group of annelids Class Clitellata = Includes earthworms and leeches Subclass Oligochaeta = Few setae, terrestrial or freshwater Subclass Hirudinea = Uses anticoagulants and has a posterior sucker</p> Signup and view all the answers

    Which statement describes the body structure of mollusks?

    <p>Body parts include head, visceral mass, and muscular foot</p> Signup and view all the answers

    Sludge worms are an indicator species that thrive in clean waters.

    <p>False</p> Signup and view all the answers

    What economic use do earthworms have?

    <p>Vermiculture for fertilizers.</p> Signup and view all the answers

    The largest group of annelids with over 10,000 species is called __________.

    <p>Class Polychaeta</p> Signup and view all the answers

    Match the following examples with their respective groups:

    <p>Snails = Mollusca Earthworms = Clitellata Leeches = Hirudinea Nereis sp. = Polychaeta</p> Signup and view all the answers

    Study Notes

    Phylum Nematoda

    • Common Names: Roundworms, threadworms, nematodes
    • Etymology: Derived from Greek words nema (thread) and odes (resembling)
    • Habitat: Ubiquitous – terrestrial, aquatic; free-living or parasitic
    • Body Size: Microscopic (82µm) to macroscopic (>8m)
    • Body Structure: Cylindrical, unsegmented; pseudocoelomate (with a body cavity); covered by a protective cuticle

    Characteristics

    • Tissue Type: Eumetazoan (true tissues)
    • Germ Layers: Triploblastic (ectoderm, mesoderm, endoderm)
    • Symmetry: Bilateral symmetry
    • Digestive System: Complete (mouth and anus)
    • Excretory System: Poorly developed; includes excretory pore
    • Circulatory System: Absent; relies on diffusion
    • Nervous System: Nerve cords, ganglia, paired sense organs (amphids anterior; phasmids posterior)
    • Reproduction: Sexual (gonochoristic – separate sexes), internal fertilization; males often have hooked posterior ends

    Adaptations

    • Cuticle: Noncellular protective covering
    • Stylet: Piercing mouthpart for feeding and secretion
    • Valve: Regulates food movement, prevents regurgitation
    • Movement: Whip-like motion due to longitudinal muscles

    Classes and Examples

    Class Chromadorea

    • Features: Amphids (pore-like/slit-like), phasmids present or absent, esophagus with 3–5 glands
    • Examples:
      • Ascaris lumbricoides (intestinal roundworm; human parasite)
      • Wuchereria bancrofti (causes filariasis/elephantiasis)
      • Caenorhabditis elegans (model organism for genetics, aging, and neuroscience)

    Class Enoplea

    • Features: Amphids (pocket-like for smell), phasmids present, bottle-shaped esophagus
    • Examples:
      • Trichinella spiralis (pork worm; causes trichinosis)

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    Related Documents

    Zoology Lecture Notes PDF

    Description

    Test your knowledge on the structure, classification, and characteristics of Nematoda and flatworms. This quiz covers topics such as parasitic adaptations, symmetry, and digestive systems. Perfect for biology students focusing on invertebrate zoology.

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