A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
Correct Answer :
C. mesoderm
Related Questions
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
Human egg is
centrolecithal
microlecithal
mesolecithal
telolecithal
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
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
Which of the following develops from ectoderm ?
Spinal cord and brain
Liver and heart
Eye and skin
Notochord and vertebral colum.
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
Constructive change in the development of frog from tadpole is
disappearance of tail
food habit becoming carnivore
land habit
excretion beocmes mesonephric
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
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
The formation, development and matura- j tion of the female gamete is called
ovulation
oogenesis
vitellogenesis
folliculogenesis
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
The expulsion of completely developed foetus from the uterus is known as
ovuation
placentation
gestation
parturition
A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
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
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
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
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
Meroblastic cleavage is found in
man
hen's egg
frog
rabbit
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
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
Cleidoic eggs are found in
birds
mammals
insects
molluscs
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
During metamorphosis, the disappearance of larval organs is called
histogenesis
paedogenesis
histolysis
paedomorphosis
Oogonia entering the growth phase of oogenesis is called
primary oocyte
secodnary oocyte
ootid
gonocyte
Which one has the capacity to reproduce without fertilization of eggs ?
Spider
Crow
Honeybee
Earthworm