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
Correct Answer :
D. gastrula and opens in archenteron
Related Questions
In frog's egg the divisoin is
holoblastic
meroblastic
diploblastic
triploblastic
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination
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 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
A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
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
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
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
Which of the following develops from ectoderm ?
Spinal cord and brain
Liver and heart
Eye and skin
Notochord and vertebral colum.
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
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
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
The intestine of tadpole is
straight
curved
coiled
zig-zag
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
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
The substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
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
Meroblastic cleavage is found in
man
hen's egg
frog
rabbit
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
During cleavage, the embryo
enlarges in size
decreases in size
retains the same size at the beginning
gradually enlarges in size
Which of the following do not show parental care over their young ones ?
mammals
lizards
fowls
earwigs
Constructive change in the development of frog from tadpole is
disappearance of tail
food habit becoming carnivore
land habit
excretion beocmes mesonephric
The first phase in the sexual reproduction of organisms is
spermatogenesis
oogenesis
spermiogenesis
gametogenesis
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm