MCQ Bank
As a result of cleavage, differences in cell size and shape highlight the ........... of tunicate embryos.
- A) Radial symmetry
- B) Bilateral symmetry
- C) Holoblastic
- D) Meroblastic
The lateral lips of the blastopore comprise those cells that will become------------ in tunicates.
- A) Parenchymal cells
- B) Epithelial cells
- C) Mesenchymal cells
- D) Neural crest cells
The invaginated region formed during gastrulation in sea urchin is called as -------
- A) Gastrocoel
- B) Gastrula
- C) Blastopore
- D) Archenteron
The ascidians are called tunictes due to ........
- A) Notochord
- B) Feeding habit
- C) Cellulose tunic
- D) Sac like body
In tunicate, the second cleavage furrow is ----------, but unlike the first division, it does not pass through the centre of the egg.
- A) Merdional
- B) Perpendicular
- C) Vertical
- D) Longituidinal
............. derived from micromeres will form the larval skeleton, so they are sometimes called skeletogenic mesenchyme.
- A) Primary mesenchyme
- B) Mesenchymal muscle cells
- C) Mesenchymal stem cells
- D) Secondary mesenchyme
Tunicates have a notochord as larvae , but they lack ........
- A) Post-anal tail
- B) Vertebrae
- C) Somites
- D) Nervous system
Tunicate gastrulation is characterized by epiboly of the -----------
- A) Ectoderm
- B) Endoderm
- C) Hypoblast
- D) Mesoderm
At the 32-cell stage,......... is formed, and gastrulation begins in tunicates.
- A) Blastocyst
- B) Blastopore
- C) Blastocoel
- D) Gastrula
During gastrulation in tunicates, the invaginated region forms a blastopore whose lips will become the ---------------.
- A) Nervous system
- B) Endodermal cells
- C) Mesodermal cells
- D) Ectodermal cells
In tunicates, the presumptive tail muscle cells are located on the ............
- A) Posterior lip of blastopore
- B) Neural plate
- C) Anterior lip of blastopore
- D) Primitive gut
The cleavage pattern found in tunicates is ......
- A) Meroblastic
- B) Bilateral
- C) Spiral
- D) Superficial
.......... stage begins at the 32 cell stage in tunicates.
- A) Morula
- B) Gastrulation
- C) Neurulation
- D) Organogenesis
The orientation of the cleavage plane in snail eggs is controlled by ...... within the oocyte.
- A) Cleavage factors
- B) Translation factors
- C) Cytoplasmic factors
- D) Nucleus factors
Some snails have their coils opening to the right of their shells, called ......
- A) Radial Coiling
- B) Spiral coiling
- C) Daxtral Coiling
- D) Sinistral Coiling
Tunicate gastrulation is characterized by the involution of the ----------- .
- A) Ectoderm
- B) Endoderm
- C) Epiblast
- D) Mesoderm
The Shell gland is an ---------- organ formed through induction by mesodermal cells.
- A) Endodermal
- B) Ectodermal
- C) Epithelial
- D) Mesodermal
Spiral holoblastic cleavage is characteristic of several animal groups like ......
- A) Cniderians
- B) Molluscs
- C) Echinoderms
- D) Arthropodes
Blastulae produced by radial cleavage have no ....... and are called stereoblastulae.
- A) Blastopore
- B) Blastocyst
- C) Blastocoel
- D) Epiblast
Tunicate gastrulation is characterized by the invagination of the ------------.
- A) Hypoblast
- B) Ectoderm
- C) Endoderm
- D) Mesoderm