Oogonia entering the growth phase of oogenesis is called
primary oocyte
secodnary oocyte
ootid
gonocyte
Correct Answer :
A. primary oocyte
Related Questions
Which of the following develops from ectoderm ?
Spinal cord and brain
Liver and heart
Eye and skin
Notochord and vertebral colum.
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
Human egg is
centrolecithal
microlecithal
mesolecithal
telolecithal
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
Metamorphosis is a characteristic feature of
direct ontogenic development
indirect ontogenic development
chordates
embryogenesis in mammals
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
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
The substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm
In forg, the sperms released from the testis take the following route to reach the ureter:
Vasa efferentia, Bidder's canal, uriniferous tubule and nephrotome
Vasa efferentia, Bidder's canal, and uriniferous tubule
Vasa efferentia, uriniferous tubule nd Bidder's canal.
Vasa deferentia, uriniferous tubule and Bidder's canal
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
A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
The first phase in the sexual reproduction of organisms is
spermatogenesis
oogenesis
spermiogenesis
gametogenesis
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
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
During cleavage, the embryo
enlarges in size
decreases in size
retains the same size at the beginning
gradually enlarges in size
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
Oogonia entering the growth phase of oogenesis is called
primary oocyte
secodnary oocyte
ootid
gonocyte
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
Meroblastic cleavage is found in
man
hen's egg
frog
rabbit
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
For fertilization of the frog's egg
sperms of same species are essential
sperms do not need penetration
sperms of any animal can fertilize
only presence of male is sufficient
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 expulsion of completely developed foetus from the uterus is known as
ovuation
placentation
gestation
parturition