The cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution
Correct Answer :
C. morphogenetic movements
Related Questions
Spermatoliosis is a process by which
the spermatids differentiate into spermatozoa
primary spermatcyte is tarnsformed into a secondary spermatocyte
spermatogonea complete multiplication phase
secondary spermatocyte extrudes polar bodies
The intestine of tadpole is
straight
curved
coiled
zig-zag
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called
spermiation
spermiogenesis
spermatogenesis
androgenesis
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
Human egg is
centrolecithal
microlecithal
mesolecithal
telolecithal
Which of the following do not show parental care over their young ones ?
mammals
lizards
fowls
earwigs
The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
During fertilization the spermatozoa penetrate through the egg membranes with the help of
flagellum
acrosome
sperm lysins released from the acrosome
mitochondira located at the middle piece
The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm
A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
Laternal line system of sense organs present in the skin of tadpole larva
completely disappears during metamorphosis
partialy retained during metamorphosis
partially disappears during later stages of metamorphosis
fully retained in the adult frog
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis
The cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution
The substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
If an unfertilized frog's egg is pricked with a micro-needle, it will
die immediately
start dividing
will remain undivided
transform into a tadpole at a faster rate
In frog's egg the divisoin is
holoblastic
meroblastic
diploblastic
triploblastic
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
The expulsion of completely developed foetus from the uterus is known as
ovuation
placentation
gestation
parturition
When the eggs are released from the ovary of frogs they are at the
primary oocyte stage
secondary oocyte stage
ootid stage
matured ova stage
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
In the human female, the primary oocytes remain small without any growth for
4-5 years
6-8 years
8 - 10 years
12 -14 years
Mammalian placenta is
a cord between mother and foetus
place of attachment in uterus wall where exchange of material between mother and foetus takes place
outer covering of foetus
allantoic part of the uterus
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
Blastopore in frogs development occurs in
blastula and opens in blastocoel
blastula and opens in archenteron
gastrula and opens in blastocoel
gastrula and opens in archenteron
The formation, development and matura- j tion of the female gamete is called
ovulation
oogenesis
vitellogenesis
folliculogenesis
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination