During metamorphosis, the disappearance of larval organs is called
histogenesis
paedogenesis
histolysis
paedomorphosis
Correct Answer :
C. histolysis
Related Questions
Which of the following do not show parental care over their young ones ?
mammals
lizards
fowls
earwigs
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
During cleavage, the embryo
enlarges in size
decreases in size
retains the same size at the beginning
gradually enlarges in size
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy
Oral contraceptives check
ovulation
fertilization
implantation
entry of sperms into vagina
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
A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
The substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
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 frog, gastrulation is completed by
epiboly
emboly
both and
delamination
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
Metamorphosis is a characteristic feature of
direct ontogenic development
indirect ontogenic development
chordates
embryogenesis in mammals
Cleidoic eggs are found in
birds
mammals
insects
molluscs
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
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
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
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 sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
The intestine of tadpole is
straight
curved
coiled
zig-zag
Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
Constructive change in the development of frog from tadpole is
disappearance of tail
food habit becoming carnivore
land habit
excretion beocmes mesonephric
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
The allantoic vesicle arises from
foregut
midgut
hindgut
somatopleure
In frog's egg the divisoin is
holoblastic
meroblastic
diploblastic
triploblastic
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
Meroblastic cleavage is found in
man
hen's egg
frog
rabbit
The formation, development and matura- j tion of the female gamete is called
ovulation
oogenesis
vitellogenesis
folliculogenesis