The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
Correct Answer :
A. neurulation
Related Questions
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
The cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution
The first phase in the sexual reproduction of organisms is
spermatogenesis
oogenesis
spermiogenesis
gametogenesis
In the growing oocyte, the nucleus enlarges in size due to an increase in
Proteins
Nucleoplasm
DNA
RNA
The formation, development and matura- j tion of the female gamete is called
ovulation
oogenesis
vitellogenesis
folliculogenesis
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
The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination
Meroblastic cleavage is found in
man
hen's egg
frog
rabbit
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
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
During the development of frog, the ar-chenteron is formed in
early blastula
late blastula
early gastrula
lategastrula
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
Human beings are
monoecious
dioecius
intersexual
hermaphrodites
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
Which one has the capacity to reproduce without fertilization of eggs ?
Spider
Crow
Honeybee
Earthworm
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
Cleidoic eggs are found in
birds
mammals
insects
molluscs
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
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
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
Oogonia entering the growth phase of oogenesis is called
primary oocyte
secodnary oocyte
ootid
gonocyte
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