PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Primitive mammals – Prototheria, Metatheria and Eutherian Mammals.

PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Primitive mammals – Prototheria, Metatheria and Eutherian Mammals.

1. The unique characteristic of Prototheria that distinguishes them from all other mammals is:

a) Presence of a true placenta b) Egg-laying (oviparous) nature c) Presence of a marsupial pouch d) Internal fertilization

2. Which of the following is an example of a Metatherian mammal?

a) Platypus b) Elephant c) Kangaroo d) Hedgehog

3. The gestation period is shortest in which group of mammals?

a) Eutheria b) Prototheria c) Metatheria d) All have a similar gestation period

4. A mammal with a cloaca, which is a single opening for the urinary, reproductive, and digestive tracts, belongs to:

a) Eutheria b) Marsupialia c) Prototheria d) Placentalia

5. The presence of mammary glands that open directly onto the skin without nipples is a feature of:

a) All mammals b) Only Metatherians c) Only Eutherians d) Only Prototherians

6. The infraclass Eutheria is characterized by:

a) Bearing live young in a highly developed state b) Giving birth to underdeveloped young c) Laying eggs d) Presence of a cloaca

7. The term 'Marsupial' refers to mammals with a:

a) Long, prehensile tail b) Pouch for carrying young c) Hard-shelled egg d) Specialized bill like a duck

8. Echidna, also known as the spiny anteater, is an example of a:

a) Metatherian b) Eutherian c) Placental mammal d) Prototherian

9. The corpus callosum, a commissure of nerves connecting the two cerebral hemispheres, is well-developed in:

a) Prototheria b) Metatheria c) Eutheria d) Both a and b

10. The dental formula is most varied and complex in which group?

a) Eutheria b) Metatheria c) Prototheria d) All have similar dental patterns

11. The viviparous nature, a long gestation period, and the presence of a well-developed placenta are features of:

a) Metatheria b) Prototheria c) Eutheria d) All mammals

12. The group of mammals that includes moles, shrews, and hedgehogs is:

a) Metatheria b) Eutheria c) Prototheria d) Monotremata

13. The infraclass Metatheria is synonymous with:

a) Placentalia b) Monotremata c) Marsupialia d) All of the above

14. The group of mammals that are considered the most primitive living mammals are:

a) Eutheria b) Prototheria c) Metatheria d) Both b and c

15. In Metatherians, the young are born in a highly undeveloped state and complete their development in the:

a) Mother's uterus b) Pouch (marsupium) c) Nest d) Hard-shelled egg

16. The structure that facilitates prolonged intrauterine development in Eutherians is the:

a) Marsupium b) Cloaca c) Placenta d) Egg shell

17. Which of these is a placental mammal?

a) Duck-billed platypus b) Kangaroo c) Elephant d) Echidna

18. The order Monotremata belongs to the infraclass:

a) Metatheria b) Prototheria c) Eutheria d) Placentalia

19. Which of the following is an example of an Eutherian mammal?

a) Opossum b) Koala c) Bat d) Tasmanian devil

20. In which group do the young develop inside a shell?

a) Prototheria b) Metatheria c) Eutheria d) All of the above

21. The infraclass of mammals that includes humans, dogs, and whales is:

a) Prototheria b) Metatheria c) Eutheria d) Marsupialia

22. The term 'placental mammal' is often used to refer to which group?

a) Prototheria b) Metatheria c) Eutheria d) Both a and b

23. The young are born highly developed in:

a) Metatheria b) Prototheria c) Eutheria d) Both a and c

24. Which of the following is a key distinguishing feature of Metatherians from Eutherians?

a) Presence of a cloaca b) Internal fertilization c) Presence of a marsupial pouch d) Endothermy

25. A mammal that lays eggs and possesses a venomous spur on its hind leg is:

a) Koala b) Platypus c) Kangaroo d) Opossum

26. The dental formula of marsupials is generally different from that of placentals. This is due to:

a) A larger number of teeth in marsupials b) The presence of a cloaca c) A different evolutionary lineage d) Their arboreal lifestyle

27. Which group of mammals is most widespread geographically?

a) Prototheria b) Metatheria c) Eutheria d) Monotremata

28. The secondary palate, which allows for breathing while feeding, is a characteristic feature of:

a) All vertebrates b) All mammals c) Only placental mammals d) Only Prototherians

29. The most diverse and successful group of mammals, based on number of species, is:

a) Prototheria b) Metatheria c) Eutheria d) Marsupialia

30. The evolutionary lineage of mammals that diverged first from the others is:

a) Eutheria b) Metatheria c) Prototheria d) Therapsida

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