27 Questions
What is the most notable feature of monotremes that distinguishes them from other mammals?
Ability to lay eggs
Which of the following is a characteristic of monotreme reproduction?
Transfer of spermatozoa through a specialized structure
What is the distinguishing feature of the platypus's bill?
Flat like a duck's bill
How do monotremes differ from other mammals in terms of milk production?
Milk is produced from a ventral abdominal wall with specialized sweet glands
What distinguishes the spiny ant-eater Tachyglossus from other monotremes?
Long and narrow snout or beak
What is the specialized function of the milk erectile penis in monotremes?
To transfer spermatozoa and not urine
Which subgroup of mammals possesses a pouch known as marsupium?
Infraclass Metatheria
What type of placenta do the eutherians possess?
True allantoic placenta
Which subgroup of mammals has a well-developed male penis and a common cloaca for rectum and urinogenital systems?
Infraclass Metatheria
Which subgroup of mammals includes carnivorous marsupials like the Tasmanian devil and insectivorous marsupials like numbats?
Infraclass Metatheria
What is a defining characteristic of Infraclass Eutheria (placental mammals)?
Development of young within the parent for a relatively long time
How many oviducts and vaginae are present in the female of Infraclass Metatheria?
Two oviducts and two vaginae
What is the most significant reproductive characteristic of monotremes?
Laying of eggs
How do the limbs of monotremes differ from those of other mammals?
They are held laterally instead of being beneath the body
What is the distinguishing feature of the platypus's bill?
Flattened bill adapted for feeding on small aquatic animals
Which feature is unique to the spiny ant-eater Tachyglossus among monotremes?
Long, narrow snout adapted for feeding on ants
What is the specialized function of the milk erectile penis in monotremes?
Transferring only spermatozoa and not urine
How do monotremes differ from other mammals in terms of milk production?
Milk is produced from specialized sweet glands but there are no nipples
Which structure is characteristic of Infraclass Metatheria?
A pouch known as marsupium
What distinguishes the eutherians (Infraclass Eutheria) from other mammalian groups?
Possession of a true allantoic placenta
What is a distinguishing feature of the mammalian digestive system?
Articulation of the dentary directly with the skull
What is the most notable characteristic of monotreme reproduction?
Young ones being born in a rudimentary condition
What distinguishes the spiny ant-eater Tachyglossus from other monotremes?
Ability to lay eggs
Which subgroup of mammals possesses a well-developed male penis and a common cloaca for rectum and urinogenital systems?
Marsupials
What type of placenta do eutherians (placental mammals) possess?
Allantoic placenta
'Mammary glands for milk production' and 'Hair contributing to constant body temperature' are characteristics of which group?
Infraclass Metatheria (marsupials)
'The young thus develop within the parent for a relatively long time' is a characteristic of which subgroup?
'Eutherians' with true allantoic placenta
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.
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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