Fraternal twins are the result of _____ separate fertilization events

• A) Three
• B) Single
• C) Two
• D) Four

Neurulation in ______ is exclusively secondary.

• A) Mammales
• B) Reptiles
• C) Fishes
• D) Amphibians

discoidal meroblastic cleavage occur in ________.

• A) none of these
• B) birds and reptiles
• C) amphibians
• D) mammals

The region between area opaca and an area pellucida is ______________.

• A) Middle Zone
• B) Intermittent zone
• C) Marginal Zone
• D) Central Zone

Gastrulation begins at the

• A) Posterior marginal zone
• B) Area pellucida
• C) Anterior marginal zone
• D) Area opaca

The name of Tunicate is because present of ------

• A) Tunicate
• B) Cellulic Tree
• C) Notochord
• D) Cellulose

In Tunicate cleavage at the ----------------- a small blastocoel is formed, and gastrulation begins.

• A) 32 cell stage
• B) 34 cell stage
• C) 36 cell stage
• D) 33 cell stage

The eggs of birds and fishes have only one small area of the egg that is free of yolk called as ----------

• A) Isolecithal
• B) Mesolecithal
• C) Centrolecithal
• D) Telolecithal

In Tunicate the second cleavage creates two small posterior blastomeres

• A) B and D
• B) B and C
• C) B and E
• D) B and A

The primary mesenchyme form the larval skeleton ------------

• A) Skeletonic paranchyme
• B) Skeletogenic paranchyme
• C) Skeletogenic mesenchyme
• D) Skeletonic mesenchyme

Ascidians have their

• A) Nerves
• B) vertebrae
• C) Brain
• D) Notochord

In Tunicate cleavage at the 32-cell stage, a small ------------- is formed, and gastrulation begins.

• A) Blastocyst
• B) Mesentoblast
• C) Blastomere
• D) Blastocoel

The hyline Layer is made up of ----------

• A) EGF3 gene and protein
• B) Hyaline cartilage
• C) Fibropellin protein
• D) Fibropellin protein 1

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

• A) Endometrium
• B) Cytometrium
• C) Ectometrium
• D) Mesometrium

The ---------------- is governed by the synthesis and degradation of cyclin.

• A) Blastocyte cell cycle
• B) Blastocyst cell cycle
• C) Blastomere cell cycle
• D) Mesentoblastic cell cycle

The right to left axis mean

• A) Mouth to anus
• B) back to Belly
• C) Between two lateral sides of the body
• D) Head to tail

While gastrulation of Tunicate the presumptive tail muscle cells---------------- are on the posterior lip of the blastopore.

• A) Blue cresent
• B) Red Cresent
• C) Yellow cresent
• D) Green Cresent

Pairs of blastomeres appear to lead this invagination into the centre of the embryo. This invagination forms a blastopore whose lips will become the ---------------.

• A) Endodermal Cells
• B) Endocrine glands
• C) Mesodermal cells
• D) Ectodermal Cells

While gastrulation process in mammalian --------------- becomes rich in the blood vessels that will provide oxygen and nutrients to the embryo.

• A) Feteus
• B) Uterus
• C) Decidua
• D) Placenta

The cells adjacent to the chorda-mesoderm, the paraxial mesoderm cells, are the precursors of the in _________fish.

• A) Somites
• B) Mesodermal somites
• C) Endodermal somites
• D) Exodermal somites