Invertebrate Zoology: Phylum Porifera and Platyhelminthes
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Questions and Answers

What is the characteristic of phylum Porifera regarding their body structure?

  • Bilateral symmetry
  • Simple, multicellular structure (correct)
  • True body cavity
  • Segmented body
  • Which of the following phyla is characterized by bilateral symmetry and a flat, ribbon-like body?

  • Phylum Annelida
  • Phylum Platyhelminthes (correct)
  • Phylum Chordata
  • Phylum Arthropoda
  • What is the characteristic of phylum Annelida regarding their body cavity?

  • Simple nervous system
  • Filter feeders
  • True body cavity (coelom) (correct)
  • No internal body cavity
  • Which of the following phyla is characterized by jointed appendages and an exoskeleton?

    <p>Phylum Arthropoda</p> Signup and view all the answers

    What is the characteristic of phylum Chordata regarding their embryonic stage?

    <p>Notochord (present in embryonic stage)</p> Signup and view all the answers

    Which of the following is an example of phylum Porifera?

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

    Which phylum is characterized by filter feeders?

    <p>Phylum Porifera</p> Signup and view all the answers

    Which of the following is a common habitat for phylum Platyhelminthes?

    <p>All of the above</p> Signup and view all the answers

    Study Notes

    Phylum Porifera

    • Porifera means "pore-bearing" in Latin
    • Characterized by:
      • Perforated body walls
      • Simple, multicellular structure
      • No true tissues or organs
      • Filter feeders
    • Examples:
      • Sponges
      • Sea sponges
    • Habitat:
      • Marine environments
      • Freshwater environments

    Phylum Platyhelminthes

    • Flatworms
    • Characterized by:
      • Bilateral symmetry
      • Flat, ribbon-like body
      • No internal body cavity
      • Simple nervous system
    • Examples:
      • Tapeworms
      • Liver flukes
      • Free-living flatworms
    • Habitat:
      • Freshwater environments
      • Marine environments
      • Terrestrial environments

    Phylum Annelida

    • Segmented worms
    • Characterized by:
      • Bilateral symmetry
      • Segmented body
      • True body cavity (coelom)
      • Closed circulatory system
    • Examples:
      • Earthworms
      • Leeches
      • Marine worms
    • Habitat:
      • Freshwater environments
      • Marine environments
      • Terrestrial environments

    Phylum Arthropoda

    • Jointed-legged animals
    • Characterized by:
      • Bilateral symmetry
      • Jointed appendages (legs, antennae)
      • Exoskeleton (made of chitin)
      • Segmented body
    • Examples:
      • Insects (beetles, flies, bees)
      • Crustaceans (crabs, lobsters, shrimp)
      • Arachnids (spiders, scorpions)
      • Centipedes
    • Habitat:
      • Terrestrial environments
      • Freshwater environments
      • Marine environments

    Phylum Chordata

    • Animals with a notochord (a flexible, rod-like structure)
    • Characterized by:
      • Bilateral symmetry
      • Notochord (present in embryonic stage)
      • Dorsal hollow nerve cord
      • Pharyngeal slits
    • Examples:
      • Vertebrates (fish, amphibians, reptiles, birds, mammals)
      • Invertebrates (tunicates, lancelets)
    • Habitat:
      • Freshwater environments
      • Marine environments
      • Terrestrial environments

    Phylum Porifera

    • Characterized by perforated body walls, simple multicellular structure, and no true tissues or organs
    • Filter feeders, with pores allowing water to flow through their bodies
    • Found in marine and freshwater environments
    • Examples include sponges and sea sponges

    Phylum Platyhelminthes

    • Characterized by bilateral symmetry and a flat, ribbon-like body
    • Lack an internal body cavity and have a simple nervous system
    • Found in freshwater, marine, and terrestrial environments
    • Examples include tapeworms, liver flukes, and free-living flatworms

    Phylum Annelida

    • Characterized by bilateral symmetry and a segmented body with a true body cavity (coelom)
    • Have a closed circulatory system and a simple nervous system
    • Found in freshwater, marine, and terrestrial environments
    • Examples include earthworms, leeches, and marine worms

    Phylum Arthropoda

    • Characterized by bilateral symmetry, jointed appendages, and an exoskeleton made of chitin
    • Have a segmented body and a complex nervous system
    • Found in terrestrial, freshwater, and marine environments
    • Examples include insects, crustaceans, arachnids, and centipedes

    Phylum Chordata

    • Characterized by bilateral symmetry, a notochord (present in embryonic stage), and a dorsal hollow nerve cord
    • Pharyngeal slits are present in embryonic stage
    • Found in freshwater, marine, and terrestrial environments
    • Examples include vertebrates (fish, amphibians, reptiles, birds, mammals) and invertebrates (tunicates, lancelets)

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    Description

    Learn about the characteristics, examples, and habitats of Phylum Porifera and Phylum Platyhelminthes, including sponges, flatworms, and tapeworms.

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