In frog's egg the divisoin is
holoblastic
meroblastic
diploblastic
triploblastic
Correct Answer :
A. holoblastic
Related Questions
Constructive change in the development of frog from tadpole is
disappearance of tail
food habit becoming carnivore
land habit
excretion beocmes mesonephric
A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
In frog's egg the divisoin is
holoblastic
meroblastic
diploblastic
triploblastic
In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called
spermiation
spermiogenesis
spermatogenesis
androgenesis
Which of the following develops from ectoderm ?
Spinal cord and brain
Liver and heart
Eye and skin
Notochord and vertebral colum.
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
During cleavage, the embryo
enlarges in size
decreases in size
retains the same size at the beginning
gradually enlarges in size
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis
The substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
Metamorphosis is a characteristic feature of
direct ontogenic development
indirect ontogenic development
chordates
embryogenesis in mammals
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 one has the capacity to reproduce without fertilization of eggs ?
Spider
Crow
Honeybee
Earthworm
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
The intestine of tadpole is
straight
curved
coiled
zig-zag
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
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
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
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
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
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
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 formation, development and matura- j tion of the female gamete is called
ovulation
oogenesis
vitellogenesis
folliculogenesis
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
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