The gametes in sponges develop from
amoebocytes
archeocytes
choanocytes
myocytes
Correct Answer :
B. archeocytes
Related Questions
Which of the following statements is true of sponges ?
One mouth and innumerable exits
Mouth serves for both, ingestion and egestion
Innumerable mouths and one exit
The body encloses a single cavity the coeienteron
The commercial bath sponge belongs to
porifera
gatropoda
coelenterata
ctenophora
Nervous system in sponges
is well developed
is in the form of a network
is made up of several interconnected ganglia
is absent
Sponges capture their food by
choanocytes
porocytes
amoebocytes
pinacocytes
Ostia are meant to
admit water current
pass out water current
ingest food
excrete waste products
The central cavity of the sponge is also called
ostea
gastral cavity
gut
gullet
Cells that aid in locomotion of a sponge are
porocytes
myocytes
choanocytes
none of these
If a carmine particle is put on the os~ culum of a living sponge, it will
adhere
rotate
be ingested
none of these
Exogenous budding, a type of asexual reproduction in sponges is known as
gemmulation
gemmation
regeneration
amphimixis
Asexual reproduction in sponges is by forming buds and
gemmules
spicules
spongin fibres
choanocytes
Phylogenetically, the sponges have evolved from
protozoans
flagellates
choano flagellate
ciliates
The pathway of entring and coming out of water of sponges is
water vascular system
canal system
feeding current
circulating current
The animal nature of sponges was established by
Robert Grant
Trembly
Robert Brown
Ellias
Lencosolenia is
free living, solitary, marine
free living, fresh water, solitary
free living, colonial, marine
Solitary, colonial, fresh water
Difference between a sponge and a metazoan is that sponge do not contain
cells
cell organisation
cell division
division of labour
The phylum porifera contains most primitive of multicellular animals called
corals
sea pen
comb jellies
sponges
The most common composition of skeleton in sponges is :
Cartilage
Mesenchyma
Spicules and spongin fibres
Myonemes
Canal system is characteristic of
corals
sponges
sea urchin
sea horse
In leucosolenia, the scleroblasts perform the function of
absorption of food material
excretion
reproduction
formation of spicules
Choanocytes in sponges are present
on the external body surface
line the gastric cavity
located between the outer and inner layers
in the mesodermal layer
The spongocoel is lined by choanocytes in
Leucosolenia
Sycon
Euspnongia
Grautia
The skeleton of sponges is mostly composed of
choanocytes
scleroblasts
pinacocytes
amoebocytes
One of the characteristic features of the sponges is the presence of
vaselike globular body
a central cavity
radial symmetry
choanocyts
Sycon belongs to the class
calcarea
porifera
hexactinellida
demospongia
The canal system in sponges does not serve the function of
nutrition
respiration
excretion
sexual reproduction
The larva of Sycoti is
parenchyma
alanula
redia
amphib las tula
Sponges capture their food by
pinacocytes
thesocytes
choamocytes
scleroblasts
The commercial bath sponge is made up of
siliceous spicules
spongin fibres
collagen fibres
elastic fibres
Gemmules are helpful in
digestion
sexual reproduction
asexual reproduction
current circulation
Path of water in a sponge is
pinacocyte � choanocyte � osculum
osculum > spongocoel � ostia
ostia > spongocoel � osculum
osculum � ostia > spongocoel