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
Correct Answer :
D. 12 -14 years
Related Questions
In the growing oocyte, the nucleus enlarges in size due to an increase in
Proteins
Nucleoplasm
DNA
RNA
The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
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
Which one has the capacity to reproduce without fertilization of eggs ?
Spider
Crow
Honeybee
Earthworm
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
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
Which of the following do not show parental care over their young ones ?
mammals
lizards
fowls
earwigs
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
Constructive change in the development of frog from tadpole is
disappearance of tail
food habit becoming carnivore
land habit
excretion beocmes mesonephric
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
The intestine of tadpole is
straight
curved
coiled
zig-zag
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
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
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 substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called
spermiation
spermiogenesis
spermatogenesis
androgenesis
Oogonia entering the growth phase of oogenesis is called
primary oocyte
secodnary oocyte
ootid
gonocyte
In frog's egg the divisoin is
holoblastic
meroblastic
diploblastic
triploblastic
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
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
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
The cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution