Biology: Embryonic Origins of Epithelial Tissue
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Questions and Answers

What is the embryonic origin of epithelial tissue?

  • Mesoderm only
  • Mesoderm and endoderm
  • Ectoderm only
  • Endoderm and ectoderm (correct)

    • Which of the following is NOT correctly matched with its germ layer tissue?

  • Ectoderm - Skin
  • Endoderm - Lining of digestive system
  • Ectoderm - Liver (correct)
  • Mesoderm - Muscles

    • What is unique to animals?

  • Nuclei
  • Chloroplasts
  • Ability to move (correct)
  • Cell walls

    • What is the most likely ancestor of all animals?

    <p>Simple multicellular organism</p> Signup and view all the answers

    What is a characteristic of diploblasts?

    <p>Two embryonic tissue layers</p> Signup and view all the answers

    Which groups of animals are non-bilaterian?

    <p>Sponges, cnidarians, and ctenophores</p> Signup and view all the answers

    What is NOT a benefit of indirect development in animals?

    <p>Increase parental investment</p> Signup and view all the answers

    How do animals reproduce?

    <p>Sexually through internal fertilization</p> Signup and view all the answers

    How are animals classified based on egg and embryo development?

    <p>Viviparous, oviparous, or ovoviviparous</p> Signup and view all the answers

    What do sponges have that ctenophores lack?

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

    What is the primary function of the outer layer of epithelial tissue in most animals?

    <p>To provide protection</p> Signup and view all the answers

    Which of the following is a characteristic shared by all animals?

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

    What is the primary difference between diploblasts and other animals?

    <p>Number of germ layers</p> Signup and view all the answers

    Which of the following groups of animals is characterized by having only two germ layers?

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

    What is the primary advantage of internal fertilization in animals?

    <p>Protection of the embryo</p> Signup and view all the answers

    Which of the following is a characteristic of ovoviviparous animals?

    <p>Eggs develop internally and young are born alive</p> Signup and view all the answers

    What is the outer layer of protective tissue that lines the surface of most animals?

    <p>Epithelial tissue</p> Signup and view all the answers

    Which two embryonic tissue layers are present in diploblasts?

    <p>Endoderm and ectoderm</p> Signup and view all the answers

    What is the primary characteristic that distinguishes animals from other kingdoms?

    <p>Ability to reproduce sexually</p> Signup and view all the answers

    What is the likely origin of all animals?

    <p>Ancient multicellular organisms</p> Signup and view all the answers

    Which of the following groups of animals consists of three distinct groups?

    <p>Non-bilaterians</p> Signup and view all the answers

    What type of fertilization occurs internally in animals?

    <p>Internal fertilization</p> Signup and view all the answers

    What is the function of the epithelial tissue in most animals?

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

    Which of the following is a characteristic of oviparous animals?

    <p>Eggs develop externally</p> Signup and view all the answers

    What is the primary difference between sponges and ctenophores?

    <p>Presence of miRNAs</p> Signup and view all the answers

    What is the primary benefit of indirect development in animals?

    <p>Produce a large number of eggs</p> Signup and view all the answers

    What is the primary function of the epithelial tissue in most animals?

    <p>To provide protection</p> Signup and view all the answers

    What is the characteristic that distinguishes diploblasts from other animals?

    <p>Presence of two germ layers</p> Signup and view all the answers

    What is the primary difference between oviparous and ovoviviparous animals?

    <p>Location of egg and embryo development</p> Signup and view all the answers

    What is a characteristic shared by all non-bilaterian animals?

    <p>Presence of two embryonic tissue layers</p> Signup and view all the answers

    What is the likely ancestor of all animals?

    <p>Simple multicellular organism</p> Signup and view all the answers

    What is the primary benefit of indirect development in animals?

    <p>Produces large numbers of eggs</p> Signup and view all the answers

    What is unique about the embryonic origin of epithelial tissue?

    <p>Originates from endoderm and ectoderm</p> Signup and view all the answers

    What is the primary characteristic of oviparous animals?

    <p>Eggs develop outside the mother's body</p> Signup and view all the answers

    What is the primary difference between ctenophores and sponges?

    <p>Presence of miRNAs</p> Signup and view all the answers

    How are animals classified based on egg and embryo development?

    <p>Oviparous, ovoviviparous, or viviparous</p> Signup and view all the answers

    Study Notes

    Embryonic Origin of Epithelial Tissue

    • Epithelial tissue originates from the endoderm and ectoderm.

    Characteristics of Animals

    • Unique traits: reproduce sexually through internal fertilization, produce large numbers of eggs, and have a larval stage in their life cycle.

    Development of Animals

    • Animals can be grouped as viviparous, oviparous, or ovoviviparous depending on where eggs and embryos develop following internal fertilization.
    • Indirect development is beneficial for producing a large number of eggs, larvae, and reproductive stages.

    Origin of Multicellularity

    • Sponges-first hypothesis suggests that sponges were the first multicellular animals, supported by the presence of miRNAs in sponges but not in ctenophores.

    Ancestry of Animals

    • The last common ancestor of all animals was likely a multicellular organism.

    Body Structure of Animals

    • Diploblasts have two embryonic tissue layers: ectoderm and endoderm.
    • Non-bilaterian animals include three groups: sponges, cnidarians, and ctenophores.

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    Description

    Explore the embryonic origins of epithelial tissue in animals, including the skin and other organs. Learn about the development of this protective tissue from endoderm and ectoderm.

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