After a sperm has entered an ovum in the process of fertilization, entry of further sperms is prevented by
development of the vitelline membrane
development of the pigment coat
condensation of yolk
formation of fertilization membrane
Correct Answer :
D. formation of fertilization membrane
Related Questions
The structure of the male reproductive system that corresponds to oviduct of the female system is
seminiferous tubules
epididymis
vas deferens
urethra
The structure that attaches testis to dorsal body wall is
tunica albuginea
scrotal sac
mesorchium
gubernaculum
Fertilizers are substances emitted from
mature eggs
immature eggs
sperms
polar body
Amnion is an extra-embryonic embrane which develops during the embryonic development of
cockroach
lizard
toad
fish
The seminal vesicle in rabbit is found at the junction of
prostrate and Cowper's glands
porstrate and vasa deferens
prostrate and urethra
vasa deferens and testis
The testes secrete a group of hormones called
progestogens
androgens
estrogens
tropic hormones
The simplest type of placenta found in man is
Haemochorial
Epitheliochorial
Syndesmochorial
Haemo-endothelial
In rabbit, the sperms are stored and nourished in
testes
vasa deferentia
epidydymis
spermatic cord
Allantois of the mammalian embryo helps in
respiration
excretion
protection
nutrition
The part of reproductive system in male which neither produces hormones nor sperms is
seminal vesicles
cowper's glands
prostrate glands
all of these
The placental barrier between animal and foetal blood is minimum
goat
cow
pig
man
Cryptorchidism is a condition in which testes are
surgically removed
not developed in foetus
unable to produce sperms
unable to descend into scrotal sacs
Sertoli cells are located in
caput epididymis
cauda epididymis
seminiferous tubules
germinal epithelium
One of the following accessory glands in the male reproductive system produces secretions that neutralise the acidity in the urethra and in the female genital tract. This is necessary for survival of sperms. This fluid is secreted by
seminal vesicle
prostrate gland
cowper's gland
coagulating gland
Those person in which testes does not descend into scrotal sac
show normal secondary sexual characters as the Leydig cells are unaffected
are normal in every respect except that they lack ability to procreate
the testes are comparatively smaller in size
all of these
Which of the following animals are hermaphrodites?
Tapeworm
Leech
Earthworm
All of these
Graffian follicles are characteristically found in the
ovary of mammal
ovary of frog
testis of frog
testis of mammal
The gestation period of rabbit is
28 - 32 days
60 - 70 days
20 - 25 days
80 - 90 days
Failure of descending testis into the scrotum is known as
paedogenes
castration
cryptorchidism
impotency
The female rabbit is
spontaneous ovulator
seasonal ovulator
induced ovulator
natural ovulator
Amniotic fluid protects the foetus from
degeneration
encystment
jerks
none of these
bartholine glands are found and associated with
female reproductive organs of cockroach
male reproductive organs of earthworm
male reproductive organs of rabbit
female reproductive organs of rabbit
Embryo of a mammal is surrounded by
yolk
amniotfe fluid
both
none of these
The region where the sperm enters egg is called
equator
rseceptive cone
animal pole
vegetal pole
The process of spermatogenesis in human testis is completed in
74 days
90 days
56 days
32 days
In the male rabbit, the testes are located in
thoracic cavity
pericardial cavity
abdominal cavity
extra-abdominal scrotal cavity
The testis are found in the abdomen in
kangaroo
elephant
rabbit
goat
The sperm count increases
if a person takes hot bath at 43 - 45°C for 30 minutes per day
if a person wears althletic supporters
during summer months
during winter months
Secodary sexual character in man is
breast
thyroid
ovary
testis and ovaries
The gestation period of elephant is about
11 months
10 months
15 months
22 months