The substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
Correct Answer :
B. sperm
Related Questions
A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
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
The formation, development and matura- j tion of the female gamete is called
ovulation
oogenesis
vitellogenesis
folliculogenesis
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
The expulsion of completely developed foetus from the uterus is known as
ovuation
placentation
gestation
parturition
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
The first phase in the sexual reproduction of organisms is
spermatogenesis
oogenesis
spermiogenesis
gametogenesis
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination
In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called
spermiation
spermiogenesis
spermatogenesis
androgenesis
Constructive change in the development of frog from tadpole is
disappearance of tail
food habit becoming carnivore
land habit
excretion beocmes mesonephric
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
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
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
A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
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
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 of the neural tube is known as
neurulation
tubulation
crania tion
none of these
In the growing oocyte, the nucleus enlarges in size due to an increase in
Proteins
Nucleoplasm
DNA
RNA
During metamorphosis, the disappearance of larval organs is called
histogenesis
paedogenesis
histolysis
paedomorphosis
Cleidoic eggs are found in
birds
mammals
insects
molluscs
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
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
The cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution
Which one has the capacity to reproduce without fertilization of eggs ?
Spider
Crow
Honeybee
Earthworm
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
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach