Developmental Biology (ZOO501)

1. The narrow connecting stalk of extra-embryonic ________ that links the embryo to the trophoblast eventually forms the vessels of the umbilical cord.

   1. Endoderm
   2. Mesoderm
   3. Ectoderm
   4. Mesentroderm

2. In mammalian cleavage at 64-cell stage, the inner cell mass and the ________ cells have become separate cell layers, neither contributing cells to the other group.

   1. Trophoblast
   2. Mesentoblast
   3. Cavitation
   4. Blastocyst

3. Chorion is derived from ________ cells.

   1. hypoblast
   2. epiblast
   3. trophoblast
   4. All of the given

4. The cytotrophoblast initially adheres to the ________ through a series of adhesion molecules.

   1. Endometrium
   2. Ectometrium
   3. Mesometrium
   4. Cytometrium

5. Tunicate gastrulation is characterized by the invagination of the endoderm, the involution of the mesoderm, and the epiboly of the ________.

   1. Endocrine
   2. Ectoderm
   3. Endoderm
   4. Mesoderm

6. Fishes, ________, and birds undergo discoidal meroblastic cleavage, wherein the early cell division do not cut through the yolk of the egg.

   1. Fishes
   2. Mammales
   3. Amphibia
   4. Reptiles

7. The ________ that are the precursors of the neutral tube invaginate into the embryo and are enclosed by neural folds.

   1. Dorsal Endodermal Cells
   2. Dorsal Mesodermal Cells
   3. Dorsal Ectodermal Cells
   4. Dorsal Endocrine Glands

8. In Tunicate the second Cleavage ________.

   1. Meridional cleavage
   2. Bilateral cleavage
   3. Holoblastic cleavage
   4. Mesentoblastic cleavage

9. Mother provides the fetus with nutrients and oxygen, and the fetus sends its waste products ________ into the maternal circulation.

   1. Carbon dioxide and urea
   2. Carbon monoxide and urea
   3. oxygen and urea
   4. Urea and oxygen

10. The cells adjacent to the chordamesoderm, the paraxial ________ cells, are the presursors of the mesodermal somites.

    1. Ectoderm
    2. Mesoderm
    3. Endoderm
    4. Blastoderm

11. The original type of trophoblast cells constitute a layer called the ________.

    1. Cytotrophoblast
    2. Ectotrophoblast
    3. Mesotrophoblast
    4. Endotrophoblast

12. The cells adjacent to the chorda-mesoderm, the paraxial mesoderm cells, are the presursors of the in ________ fish.

    1. Endodermal somites
    2. Mesodermal somites
    3. Exodermal somites
    4. Somites

13. A ________ is a cell derived from cleavage in an early embryo.

    1. Blastomere
    2. Ectoderm
    3. Endoderm
    4. Mesoderm

14. Between the area pellucida and the area opaca is a thin layer of cells called the ________.

    1. Sub germinal cavity
    2. Egg white
    3. Albumin
    4. Marginal belt

15. In Nematode cleavage is ________.

    1. Bilateral
    2. Radial
    3. Spiral
    4. Rotational

16. The first segregation in mammalian cells within the inner cell mass results in the formation of the ________.

    1. Primitive endoderm
    2. Primitive mesoderm
    3. Primitive ectoderm
    4. Primitive kit

17. In Tunicate cleavage during the next three divisions, differences in cell size and shape highlight the ________ of these embryos.

    1. Holoblastic
    2. Meridional
    3. Bilateral Symmetry
    4. Holos symmetry

18. During mammalian cleavage the trophoblast cells secrete fluid into the morula to create a blastocoels this process called as ________.

    1. Blastocyst
    2. Cavitation
    3. Primitive kit
    4. Primitive groove

19. The peripheral ring of blastodem cells that have not shed their deep cells constitutes the ________.

    1. Area pellucid
    2. Area opaca
    3. Marginal zone
    4. Marginal belt

20. The lateral lips of the blastopore comprise those cells that will become ________.

    1. Parenchyme
    2. Mesenchyme
    3. Photosynthetic parenchyme
    4. Storage Parenchyme

21. discoidal meroblastic cleavage occur in ________.

    1. amphibians
    2. birds and reptiles
    3. mammals
    4. None of the given

Select a course code for Objective Questions:

ACC311 ACC501 BIF101 BIF401 BIF501 BIO101 BIO201 BIO202 BIO203 BIO204 BIO301 BIO302 BIO303 BIO401 BIO503 BNK603 BT101 BT201 BT301 BT302 BT401 BT402 BT403 BT404 BT405 BT406 BT501 BT504 BT505 BT604 CHE201 CHE301 CS001 CS101 CS201 CS202 CS204 CS301 CS302 CS304 CS311 CS401 CS402 CS403 CS408 CS501 CS502 CS504 CS506 CS508 CS601 CS602 CS604 CS605 CS607 CS609 CS610 CS614 CS707 CS710 ECO401 ECO402 ECO403 ECO404 EDU302 EDU401 EDU402 EDU501 EDU601 ENG101 ENG201 ENG301 ENG501 FIN611 FIN624 FIN625 ISL201 IT430 MCM101 MCM301 MGMT623 MGT101 MGT211 MGT301 MGT401 MGT402 MGT501 MGT502 MGT503 MGT510 MGT601 MGT603 MKT501 MKT610 MKT630 MTH101 MTH202 MTH302 MTH501 MTH601 MTH634 PAK301 PHY101 PHY301 PSY101 PSY403 PSY502 PSY512 SOC101 SOC301 SOC401 STA301 STA630 STA641 ZOO102 ZOO401 ZOO501 ZOO502 ZOO503 ZOO504 ZOO505 ZOO506 ZOO510 ZOO630

Select a course code for Subjective Questions:

ACC311 CS001 CS101 CS201 CS301 CS607 CS701 CS702 CS703 CS704 CS707 CS708 CS710 CS711 CS718 CS721 CS724 ECO401 ECO403 ENG101 ENG301 MGT703 MTH501 STA301