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
Correct Answer :
B. line the gastric cavity
Related Questions
The animal nature of sponges was established by
Robert Grant
Trembly
Robert Brown
Ellias
Sponges capture their food by
choanocytes
porocytes
amoebocytes
pinacocytes
Difference between a sponge and a metazoan is that sponge do not contain
cells
cell organisation
cell division
division of labour
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
In leucosolenia, the scleroblasts perform the function of
absorption of food material
excretion
reproduction
formation of spicules
The pathway of entring and coming out of water of sponges is
water vascular system
canal system
feeding current
circulating current
Which of the following is given as a gift in Japan?
Hyalonema
Tethya
Euplectalla
Pheronetna
Sponges belong to the phylum
sporozoa
mastigophora
porifera
coelenterata
The commercial bath sponge belongs to
porifera
gatropoda
coelenterata
ctenophora
Sponges are not found in
cold water
sea water
sandy shore
brackish water
The gametes in sponges develop from
amoebocytes
archeocytes
choanocytes
myocytes
The larva of Sycoti is
parenchyma
alanula
redia
amphib las tula
Sycon belongs to the class
calcarea
porifera
hexactinellida
demospongia
Nervous system in sponges
is well developed
is in the form of a network
is made up of several interconnected ganglia
is absent
The spongocoel is lined by choanocytes in
Leucosolenia
Sycon
Euspnongia
Grautia
Path of water in a sponge is
pinacocyte � choanocyte � osculum
osculum > spongocoel � ostia
ostia > spongocoel � osculum
osculum � ostia > spongocoel
A chamber which is common in different types of canal system:
Radial canal
Inhalant canal
Spongocoel
None of these
Collared, flagellated cells covering large parts of the inner chambers of sponges and helping to keep water circulating are
choanocytes
porocytes
pinacocytes
amoebocytes
Ostia are meant to
admit water current
pass out water current
ingest food
excrete waste products
If a carmine particle is put on the os~ culum of a living sponge, it will
adhere
rotate
be ingested
none of these
Sponges capture their food by
pinacocytes
thesocytes
choamocytes
scleroblasts
The skeleton in sponges is composed of
gemmules
spicules
spongin fibre
trychocysts
Exogenous budding, a type of asexual reproduction in sponges is known as
gemmulation
gemmation
regeneration
amphimixis
One of the characteristic features of the sponges is the presence of
vaselike globular body
a central cavity
radial symmetry
choanocyts
Larva of sponge is known as
planula larva
amphiblastula larva
trochophore larva
glochidium larva
Animals of phylum porifera are characterised by
diploblastic organisation
coelenteron
canal system
coelom
Canal system in Leucosolenia is
asconoid
syconoid
leuconoid
rhagon
The phylum porifera contains most primitive of multicellular animals called
corals
sea pen
comb jellies
sponges
Gemmules are helpful in
digestion
sexual reproduction
asexual reproduction
current circulation
The canal system in sponges does not serve the function of
nutrition
respiration
excretion
sexual reproduction