What is left, when bath-sponges dries up?
spicules
holdfast
tentacles
spongin fibres
The metazoans, without tissue grade of organisation, are called
parazoa
protozoa
eumetazoa
deuterostemia
Animals with radial symmetry in adult and bilateral symmetry in larva are
annelids
coelenterates
echinoderms
platyhelminthes
Choanocytes is an ascon type of canal system, which is lined by
porocyte
incurrent
apopyle
spongocoel
The organisms attached to the substratum,generally, possesses
radial symmetry
one single opening of digestive canal
asymmetrical body
cilia on surface to create water current
Contractile vacuole is absent in
sporozoa
sarcodina
flagellata
ciliata
The formation of canal system in sponges is due to
reproduction
porous walls
folding of inner walls
gastro-vascular system
Choanocytes perform
excretion
nutrition
secretion of spicules
Which of the following are lowest 'multicellular grade' organisms?
sponges
prokaryotes
monerans
Alimentary canal is not found in
apoda
cestoda
gastropoda
arachnida
