A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
Correct Answer :
A. one cell
Related Questions
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
Which of the following develops from ectoderm ?
Spinal cord and brain
Liver and heart
Eye and skin
Notochord and vertebral colum.
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
Which of the following do not show parental care over their young ones ?
mammals
lizards
fowls
earwigs
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
Meroblastic cleavage is found in
man
hen's egg
frog
rabbit
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 order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called
spermiation
spermiogenesis
spermatogenesis
androgenesis
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
In the growing oocyte, the nucleus enlarges in size due to an increase in
Proteins
Nucleoplasm
DNA
RNA
Which one has the capacity to reproduce without fertilization of eggs ?
Spider
Crow
Honeybee
Earthworm
Oogonia entering the growth phase of oogenesis is called
primary oocyte
secodnary oocyte
ootid
gonocyte
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
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination
Human egg is
centrolecithal
microlecithal
mesolecithal
telolecithal
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
The intestine of tadpole is
straight
curved
coiled
zig-zag
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
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
Cleidoic eggs are found in
birds
mammals
insects
molluscs
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
In forg, the sperms released from the testis take the following route to reach the ureter:
Vasa efferentia, Bidder's canal, uriniferous tubule and nephrotome
Vasa efferentia, Bidder's canal, and uriniferous tubule
Vasa efferentia, uriniferous tubule nd Bidder's canal.
Vasa deferentia, uriniferous tubule and Bidder's canal
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis
A true coelom is covered by
ectoderm
endoderm
mesoderm
ecto and mesoderm
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
During cleavage, the embryo
enlarges in size
decreases in size
retains the same size at the beginning
gradually enlarges in size