ectoderm
endoderm
mesoglea
coelenteron
D. coelenteron
Earthworm
Hydra
Amoeba
Cockroach
Aurelia
Metridium
Physalia
Tubipora
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
Plenty of food is present
Pond dries up
Water becomes muddy
Hydra is alone
nerve cells
sensory cells
muscle fibres
no cells
pinnate
hollow
solid
frilled
protogynous
hermaphrodite
monoecious
protandrous
absence of musculoepithelial cells in the body wall
absence of nematocysts
absence of sensory cells
absence of sexual reproduction
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
hydrozoa
scyphozoa
actinozoa
all of these
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
mesoglea
general surface
pellicle
gastrodermis
Aurelia
Sea anemone
Obelia
Hydra
Hydra
Obelia
Physalia
Acerelia
Metabolism
Metamerism
Melting
Metamorphosis
upper part
middle part
tentacles
lower part
hydrozoa
scyphozoa
actinozoa
all of these
saprozoic
herbivorous
insectivorous
carnivorous
sponges
anthozoans
molluscs
hydrozoans
digestion and circulation
digestion and storage
excretion and digestion
circulation and storage
non-cellular and jelly like material
cellular jelly like material containing sensory cells
cellular jelly like material containing nerve cells
both (a) and (c)
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
both parts die
both parts make up the loss and form two new individuals
both parts live independently as they are
none of these
musculo-epithelial cells
musculo-nutritive cells
sensory cells
cniboblasts
Both show polymorphism
Both possess a larval stage in their life history called planula
Both are found in fresh water
Both havb a jelly like mesoglea with no cells
on the tentacles
on the hypostome
on the basal disc
in the gastrodermis
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
coelom
enterocoel
pseudocoel
coelenteron
locomotion
balancing
swimming
reproduction
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage