During cleavage, the embryo
enlarges in size
decreases in size
retains the same size at the beginning
gradually enlarges in size
Correct Answer :
C. retains the same size at the beginning
Related Questions
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
Human egg is
centrolecithal
microlecithal
mesolecithal
telolecithal
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
The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm
Cleidoic eggs are found in
birds
mammals
insects
molluscs
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
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
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
The intestine of tadpole is
straight
curved
coiled
zig-zag
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
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
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
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
In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called
spermiation
spermiogenesis
spermatogenesis
androgenesis
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
During metamorphosis, the disappearance of larval organs is called
histogenesis
paedogenesis
histolysis
paedomorphosis
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination
A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
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
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
Which of the following develops from ectoderm ?
Spinal cord and brain
Liver and heart
Eye and skin
Notochord and vertebral colum.
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
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 cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis