Nervous system in sponges
is well developed
is in the form of a network
is made up of several interconnected ganglia
is absent
Correct Answer :
D. is absent
Related Questions
Path of water in a sponge is
pinacocyte � choanocyte � osculum
osculum > spongocoel � ostia
ostia > spongocoel � osculum
osculum � ostia > spongocoel
In leucosolenia, the scleroblasts perform the function of
absorption of food material
excretion
reproduction
formation of spicules
Difference between a sponge and a metazoan is that sponge do not contain
cells
cell organisation
cell division
division of labour
Sponges are not found in
cold water
sea water
sandy shore
brackish water
The pathway of entring and coming out of water of sponges is
water vascular system
canal system
feeding current
circulating current
The central cavity of the sponge is also called
ostea
gastral cavity
gut
gullet
Sponges with a skeleton of calcium carbonate belongs to the class
calcarea
demospongia
anthozoa
hexactinellida
Asexual reproduction in sponges is by forming buds and
gemmules
spicules
spongin fibres
choanocytes
Animals of phylum porifera are characterised by
diploblastic organisation
coelenteron
canal system
coelom
Ostia are meant to
admit water current
pass out water current
ingest food
excrete waste products
The commercial bath sponge is made up of
siliceous spicules
spongin fibres
collagen fibres
elastic fibres
A sponge is a
coelomata
acoelomata
metacoelomata
pseudocoelomates
The larva of Sycoti is
parenchyma
alanula
redia
amphib las tula
The phylum porifera contains most primitive of multicellular animals called
corals
sea pen
comb jellies
sponges
The skeleton of sponges is mostly composed of
choanocytes
scleroblasts
pinacocytes
amoebocytes
Food is stored in-of sponges.
trophocytes
thesocytes
desmocytes
archeocytes
Sponges capture their food by
pinacocytes
thesocytes
choamocytes
scleroblasts
Collared, flagellated cells covering large parts of the inner chambers of sponges and helping to keep water circulating are
choanocytes
porocytes
pinacocytes
amoebocytes
The only fresh water species of sponges is
Scypha
Euspcmgia
Spongilla
None of these
The most common composition of skeleton in sponges is :
Cartilage
Mesenchyma
Spicules and spongin fibres
Myonemes
Nervous system in sponges
is well developed
is in the form of a network
is made up of several interconnected ganglia
is absent
The canal system in sponges does not serve the function of
nutrition
respiration
excretion
sexual reproduction
The spongocoel is lined by choanocytes in
Leucosolenia
Sycon
Euspnongia
Grautia
Cells that aid in locomotion of a sponge are
porocytes
myocytes
choanocytes
none of these
The commercial bath sponge belongs to
porifera
gatropoda
coelenterata
ctenophora
Phylogenetically, the sponges have evolved from
protozoans
flagellates
choano flagellate
ciliates
Sycon belongs to the class
calcarea
porifera
hexactinellida
demospongia
Exogenous budding, a type of asexual reproduction in sponges is known as
gemmulation
gemmation
regeneration
amphimixis
Gemmules are helpful in
digestion
sexual reproduction
asexual reproduction
current circulation
The skeleton in sponges is composed of
gemmules
spicules
spongin fibre
trychocysts