Alimentary canal is not found in
apoda
cestoda
gastropoda
arachnida
What is left, when bath-sponges dries up?
spicules
holdfast
tentacles
spongin fibres
Flatworms and ribbonworms have
bilateral symmetry
organ level of organization
presence of mesoderm
all of these
The metazoans, without tissue grade of organisation, are called
parazoa
protozoa
eumetazoa
deuterostemia
Which of the following is not diploblastic?
porifera
cnideria
nematoda
ctenophora
Radial symmetry is, usually, exhibited in animals which
live in water
have ciliary mode of feeding
are attached to the substratum
have one opening of alimentary canal
Which of the following makes sponges different from metazoan?
diploblastic
sedentary
choanocytes
acoelomate
The scientist who suggested that in about 45 days the older cells of Hydra are replaced by new cells was
Brien
Trembly
Spemann
Linnaeus
Contractile vacuole is absent in
sporozoa
sarcodina
flagellata
ciliata
Choanocytes is an ascon type of canal system, which is lined by
porocyte
incurrent
apopyle
spongocoel
