MCQ Bank
The ______ induces the formation of the forebrain in vertebrates.
- A) Neural plate
- B) Axial mesoderm
- C) Chordamesoderm
- D) Prechordal plate
During gastrulation process in mammals, --------------- becomes rich in the blood vessels that will provide oxygen and nutrients to the embryo.
- A) Ovary
- B) Oviduct
- C) Uterus
- D) Decidua
The first segregation in mammalian cells within the inner cell mass results in the formation of the---------------------.
- A) Primitive mesoderm
- B) Primitive endoderm
- C) Primitive ectoderm
- D) Primtive gut
In mammals, mononucleated trophoblasts form inner layer called .......
- A) Cytotrophoblast
- B) Syncytiotrophoblast
- C) Decidua
- D) Placenta
In birds, ....... is critical in determining anterior-posterior axis.
- A) Temperature
- B) Pressure
- C) Gravity
- D) pH
Mother provides the fetus with nutrients and oxygen, and the fetus sends waste products ........ into maternal circulation.
- A) Ammonia and Urea
- B) Ammonia and Uric acid
- C) Carbon monoxide and Urea
- D) Carbon dioxide and Urea
In amphibians, such as Xenopus, the tail neural tube is derived from ..........
- A) Secondary neurulation
- B) Quaternary neurulation
- C) Primary neurulation
- D) Tertiary neurulation
The mammalian embryo obtains nutrients directly from ------------
- A) Mother
- B) Blood
- C) Uterus
- D) Egg yolk
Discoidal meroblastic cleavage occurs in ......
- A) Amphibians
- B) Echinoderms
- C) Birds and Reptiles
- D) Mammals
Gastrulation begins at the ........in the vertebrates.
- A) Posterior marginal zone
- B) Area opaca
- C) Anterior marginal zone
- D) Area pellucida
The cytotrophoblast initially adheres to the ------------------- through a series of adhesion molecules.
- A) Endometrium
- B) Ectometrium
- C) Perimetrium
- D) Myometrium
The chorion embryonic layer is derived from ______ cells in mammals.
- A) Hypoblast
- B) Trophoblast
- C) Inner cell mass
- D) Epiblast
Fishes, ........ and birds undergo discoidal meroblastic cleavage, wherein the early cell divisions do not cut through the yolk of the egg.
- A) Mammals
- B) Reptiles
- C) Echinoderms
- D) Amphibians
The narrow connecting stalk of extra-embryonic -------------- that links the embryo to the trophoblast eventually forms the vessels of the umbilical cord.
- A) Mesoderm
- B) Epiblast
- C) Ectoderm
- D) Endoderm
The process by which the neural plate bends up and later fuses to form neural tube that will eventually differentiate into nervous system is called ........
- A) Specification
- B) Differentiation
- C) Neurulation
- D) Gastrulation