Sub-Class Prototheria Characteristics
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Questions and Answers

What is the most notable feature of monotremes that distinguishes them from other mammals?

  • Shoulder girdle specialized for rapid swimming
  • Ability to lay eggs (correct)
  • Presence of milk erectile penis
  • Production of milk without nipples

    • Which of the following is a characteristic of monotreme reproduction?

  • Transfer of spermatozoa through a specialized structure (correct)
  • Development of live offspring
  • Production of eggs internally
  • Presence of nipples for milk feeding

    • What is the distinguishing feature of the platypus's bill?

  • Long and narrow
  • Adapted for feeding on ants
  • Flat like a duck's bill (correct)
  • Has specialized sweet glands

    • How do monotremes differ from other mammals in terms of milk production?

    <p>Milk is produced from a ventral abdominal wall with specialized sweet glands</p> Signup and view all the answers

    What distinguishes the spiny ant-eater Tachyglossus from other monotremes?

    <p>Long and narrow snout or beak</p> Signup and view all the answers

    What is the specialized function of the milk erectile penis in monotremes?

    <p>To transfer spermatozoa and not urine</p> Signup and view all the answers

    Which subgroup of mammals possesses a pouch known as marsupium?

    <p>Infraclass Metatheria</p> Signup and view all the answers

    What type of placenta do the eutherians possess?

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

    Which subgroup of mammals has a well-developed male penis and a common cloaca for rectum and urinogenital systems?

    <p>Infraclass Metatheria</p> Signup and view all the answers

    Which subgroup of mammals includes carnivorous marsupials like the Tasmanian devil and insectivorous marsupials like numbats?

    <p>Infraclass Metatheria</p> Signup and view all the answers

    What is a defining characteristic of Infraclass Eutheria (placental mammals)?

    <p>Development of young within the parent for a relatively long time</p> Signup and view all the answers

    How many oviducts and vaginae are present in the female of Infraclass Metatheria?

    <p>Two oviducts and two vaginae</p> Signup and view all the answers

    What is the most significant reproductive characteristic of monotremes?

    <p>Laying of eggs</p> Signup and view all the answers

    How do the limbs of monotremes differ from those of other mammals?

    <p>They are held laterally instead of being beneath the body</p> Signup and view all the answers

    What is the distinguishing feature of the platypus's bill?

    <p>Flattened bill adapted for feeding on small aquatic animals</p> Signup and view all the answers

    Which feature is unique to the spiny ant-eater Tachyglossus among monotremes?

    <p>Long, narrow snout adapted for feeding on ants</p> Signup and view all the answers

    What is the specialized function of the milk erectile penis in monotremes?

    <p>Transferring only spermatozoa and not urine</p> Signup and view all the answers

    How do monotremes differ from other mammals in terms of milk production?

    <p>Milk is produced from specialized sweet glands but there are no nipples</p> Signup and view all the answers

    Which structure is characteristic of Infraclass Metatheria?

    <p>A pouch known as marsupium</p> Signup and view all the answers

    What distinguishes the eutherians (Infraclass Eutheria) from other mammalian groups?

    <p>Possession of a true allantoic placenta</p> Signup and view all the answers

    What is a distinguishing feature of the mammalian digestive system?

    <p>Articulation of the dentary directly with the skull</p> Signup and view all the answers

    What is the most notable characteristic of monotreme reproduction?

    <p>Young ones being born in a rudimentary condition</p> Signup and view all the answers

    What distinguishes the spiny ant-eater Tachyglossus from other monotremes?

    <p>Ability to lay eggs</p> Signup and view all the answers

    Which subgroup of mammals possesses a well-developed male penis and a common cloaca for rectum and urinogenital systems?

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

    What type of placenta do eutherians (placental mammals) possess?

    <p>Allantoic placenta</p> Signup and view all the answers

    'Mammary glands for milk production' and 'Hair contributing to constant body temperature' are characteristics of which group?

    <p>Infraclass Metatheria (marsupials)</p> Signup and view all the answers

    'The young thus develop within the parent for a relatively long time' is a characteristic of which subgroup?

    <p>'Eutherians' with true allantoic placenta</p> Signup and view all the answers

    Study Notes

    Monotremes

    • The most notable feature of monotremes that distinguishes them from other mammals is the laying of eggs.
    • Monotremes have a characteristic of reproductive mode, where they lay eggs instead of giving birth to live young.
    • The distinguishing feature of the platypus's bill is that it is leathery and covered in soft, sensitive skin.
    • Monotremes differ from other mammals in terms of milk production, where they produce milk, but lack nipples.
    • The spiny ant-eater Tachyglossus is distinguished from other monotremes by its spiny, porcupine-like body.

    Mammary Glands and Hair

    • Mammary glands for milk production and hair contributing to constant body temperature are characteristics of mammals.

    Marsupials

    • The subgroup of mammals that possesses a pouch known as marsupium is marsupials.
    • The female of Infraclass Metatheria (marsupials) has two oviducts and two vaginae.
    • The structure characteristic of Infraclass Metatheria is a pouch known as marsupium.
    • The Tasmanian devil and numbats are examples of carnivorous and insectivorous marsupials, respectively.

    Eutherians (Placental Mammals)

    • Eutherians possess a well-developed male penis and a common cloaca for rectum and urinogenital systems.
    • Eutherians have a type of placenta called a chorionic placenta.
    • The defining characteristic of Infraclass Eutheria (placental mammals) is that the young develop within the parent for a relatively long time.
    • Eutherians are distinguished from other mammalian groups by their ability to give birth to live young.

    Miscellaneous

    • The specialized function of the milk erectile penis in monotremes is not specified.
    • The limbs of monotremes differ from those of other mammals in an unspecified way.
    • The mammalian digestive system is characterized by a unique feature, which is not specified.
    • The most notable characteristic of monotreme reproduction is the laying of eggs.

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    Test your knowledge about the characteristics of Sub-Class Prototheria, which includes monotremes with unique reproductive and anatomical features such as egg-laying, milk erectile penis, and lateral limb positioning.

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