Metazoa General Characteristics Quiz
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Questions and Answers

What is the major function of colloblasts in comb jellies?

  • Locomotion
  • Feeding (correct)
  • Excretion
  • Reproduction
  • Which phylum consists of animals that are radially symmetric and diploblastic?

  • Phylum Myxozoa
  • Phylum Cnidaria
  • Phylum Ctenophora (correct)
  • Phylum Platyhelminthes
  • What is the main distinguishing feature of comb jellies when observed?

  • Flame cells for excretion
  • Bristle-like mechanoreceptors
  • Rows of ciliary plates or combs (correct)
  • Sophisticated organs for locomotion
  • What is the primary method by which comb jellies facilitate feeding?

    <p>Capturing prey with colloblasts (D)</p> Signup and view all the answers

    Which phylum is characterized by being dorsoventrally flattened and ribbon-like, with both free-living and parasitic species?

    <p>Phylum Platyhelminthes (B)</p> Signup and view all the answers

    What is the function of protonephridia or flame cells in flatworms?

    <p>Excretion and water balance (A)</p> Signup and view all the answers

    What type of data is used for investigating evolution, according to the text?

    <p>Fossils (C)</p> Signup and view all the answers

    During which period did the Ediacaran Fauna exist?

    <p>Ediacaran Period (635 - 543 MYA) (D)</p> Signup and view all the answers

    Which organism is considered to be the oldest animal discovered without the aid of a microscope?

    <p>Dickinsonia (C)</p> Signup and view all the answers

    What is the main feature that sponges and choanoflagellates are claimed to share?

    <p>Common ancestor (C)</p> Signup and view all the answers

    What is the significance of Cadherin in relation to sponges?

    <p>Crucial for cell-to-cell adhesion (C)</p> Signup and view all the answers

    What behavior do two organisms exhibit in endosymbiosis?

    <p>Living together with one inside the other (C)</p> Signup and view all the answers

    Which of the following are characteristics shared by all members of Metazoa?

    <p>Multicellular heterotrophs with diverse forms and active movement (A)</p> Signup and view all the answers

    Which phylum lacks a gut, muscles, nervous system, and polarity but utilizes choanocytes for suspension feeding?

    <p>Porifera (sponges) (C)</p> Signup and view all the answers

    Which of the following is true about phylum Porifera?

    <p>They lack overall symmetry (C)</p> Signup and view all the answers

    What is the internal skeleton of adult sponges composed of when present?

    <p>Calcium carbonate or silicon dioxide spicules (D)</p> Signup and view all the answers

    In what type of body cavity are coelomates classified?

    <p>Coelomate (A)</p> Signup and view all the answers

    Which subphylum do cnidarians like jellies, sea anemones, and corals belong to?

    <p>Anthozoa (C)</p> Signup and view all the answers

    What is a key feature of specialized cnidae that facilitate prey capture in cnidarians?

    <p>Nematocysts (A)</p> Signup and view all the answers

    Which type of reproduction results in a larvae with several cell layers in sponges?

    <p>Sexual reproduction (C)</p> Signup and view all the answers

    'Polyps' proliferate asexually by which method in cnidarians like sea anemone?

    <p>'Budding' (C)</p> Signup and view all the answers

    Study Notes

    Phylum Characteristics

    • Phylum Cnidaria consists of radially symmetric, diploblastic animals
    • Phylum Platyhelminthes consists of dorsoventrally flattened, ribbon-like animals with both free-living and parasitic species
    • Phylum Porifera lacks a gut, muscles, nervous system, and polarity, but utilizes choanocytes for suspension feeding

    Comb Jellies

    • Colloblasts are used for capturing prey in comb jellies
    • Comb jellies are characterized by the presence of rows of cilia (comb-like structures) that reflect light, making them sparkle
    • Comb jellies facilitate feeding through the use of colloblasts, which capture prey

    Flatworms

    • Protonephridia or flame cells are used for excretion and osmoregulation in flatworms

    Evolution

    • Morphological data is used for investigating evolution

    Fossil Record

    • The Ediacaran Fauna existed during the Ediacaran period
    • Dickinsonia is considered the oldest animal discovered without the aid of a microscope

    Sponges and Choanoflagellates

    • Sponges and choanoflagellates share a key feature: the presence of choanocytes
    • Cadherin is significant in sponges because it is involved in cell adhesion

    Endosymbiosis

    • In endosymbiosis, two organisms, such as algae and coral, live in a symbiotic relationship

    Metazoa

    • All members of Metazoa share the characteristics of multicellularity and heterotrophy

    Sponges

    • The internal skeleton of adult sponges is composed of spicules or spongin when present
    • Sponges are classified as coelomates, with a true body cavity

    Cnidarians

    • Cnidarians, such as jellies, sea anemones, and corals, belong to the subphylum Medusozoa
    • Specialized cnidae (stinging cells) facilitate prey capture in cnidarians
    • Polyps proliferate asexually through budding in cnidarians like sea anemones

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    Description

    Test your knowledge on the general characteristics shared by members of Metazoa, including land vertebrates like amphibians, reptiles, birds, and mammals. Explore topics such as Derm Layers, Body Cavity types, and key traits like being multicellular heterotrophs without cell walls.

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