The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm
Correct Answer :
C. ectoderm
Related Questions
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
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
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
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
Metamorphosis is a characteristic feature of
direct ontogenic development
indirect ontogenic development
chordates
embryogenesis in mammals
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
In frog's egg the divisoin is
holoblastic
meroblastic
diploblastic
triploblastic
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
The intestine of tadpole is
straight
curved
coiled
zig-zag
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
Which of the following do not show parental care over their young ones ?
mammals
lizards
fowls
earwigs
Cleidoic eggs are found in
birds
mammals
insects
molluscs
The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm
The cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
The expulsion of completely developed foetus from the uterus is known as
ovuation
placentation
gestation
parturition
During metamorphosis, the disappearance of larval organs is called
histogenesis
paedogenesis
histolysis
paedomorphosis
In the growing oocyte, the nucleus enlarges in size due to an increase in
Proteins
Nucleoplasm
DNA
RNA
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
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
Meroblastic cleavage is found in
man
hen's egg
frog
rabbit
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
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 first phase in the sexual reproduction of organisms is
spermatogenesis
oogenesis
spermiogenesis
gametogenesis
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
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
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