epidermis alone
gastrodermis alone
both (a) and (b)
(a), (b) and tentacles
A. epidermis alone
Hydra
Obelia
Physalia
Acerelia
sponges
anthozoans
molluscs
hydrozoans
stirring up the digestive fluid in the digestive cavity
engulfing food particles
engulfing semi-digested particles inside food- absorbing cells
none of these
coelom
enterocoel
pseudocoel
coelenteron
Sea anemone
Aurelia
Obelia
Hydra
the hypostome
the junction of hypostome and stomach
in junction of stomach and stalk
the stomach
Blastostyle of Obelia
Gonad of Hydra
Medusa of Obelia
Polyp of Obelia
hydrozoa
scyphozoa
anthozoa
all the three
several types of organ-systems in an individual
different kinds of larval forms in the life history of an animal
different functions performed by a single kind of organism
several different types of individuals in a species
Zoochlorella
Chlamydomonas
Euglena
None of these
Connective tissue
Epithelial tissue
Muscular tissue
Nervous tissue
both parts die
both parts make up the loss and form two new individuals
both parts live independently as they are
none of these
bilateral symmetry
radial symmetry
asymmetry
spherical symmetry
attachment
respiration
food capturing
offense
absence of musculoepithelial cells in the body wall
absence of nematocysts
absence of sensory cells
absence of sexual reproduction
Tubipora
Astrangia
Meandra
Aeropora
cellular layers
tissues
cell differentiation
organs
sponges
coelenterates
annelids
arthropods
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
Earthworm
Hydra
Amoeba
Cockroach
tentacles
cnidoblasts
hypostome
interstitial cells
below the ovaries
below the tentacles
further down the tentacles to occupy central position of the body
anywhere on the body between tentacles and adhesive disc
ecotderm and endoderm
ectoderm and mesoderm
ectoderm, mesoderm and endoderm
epidermis, mesoglea and endoderm
Aurelia
Hydra
Metridium
Physalia
pinnate
hollow
solid
frilled
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
hydrula
planula
tadpole
amphiblastula
non-cellular and jelly like material
cellular jelly like material containing sensory cells
cellular jelly like material containing nerve cells
both (a) and (c)
protogynous
hermaphrodite
monoecious
protandrous