During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
Correct Answer :
D. lategastrula
Related Questions
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
The expulsion of completely developed foetus from the uterus is known as
ovuation
placentation
gestation
parturition
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
The first phase in the sexual reproduction of organisms is
spermatogenesis
oogenesis
spermiogenesis
gametogenesis
Which one has the capacity to reproduce without fertilization of eggs ?
Spider
Crow
Honeybee
Earthworm
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
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
During metamorphosis, the disappearance of larval organs is called
histogenesis
paedogenesis
histolysis
paedomorphosis
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination
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
In the growing oocyte, the nucleus enlarges in size due to an increase in
Proteins
Nucleoplasm
DNA
RNA
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
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
Cleidoic eggs are found in
birds
mammals
insects
molluscs
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 the human female, the primary oocytes remain small without any growth for
4-5 years
6-8 years
8 - 10 years
12 -14 years
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 do not show parental care over their young ones ?
mammals
lizards
fowls
earwigs
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
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 sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
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