Polymorphic coelentrates are the members of the class
hydrozoa
scyphozoa
actinozoa
all of these
Correct Answer :
A. hydrozoa
Related Questions
Ctenophores differ form cnidorians in one important aspect, that is
absence of musculoepithelial cells in the body wall
absence of nematocysts
absence of sensory cells
absence of sexual reproduction
Digestion in Hydra is
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
The first invertebrates to develop a true nervous system are
sponges
coelenterates
annelids
arthropods
The mesoglea of Hydra contains
nerve cells
sensory cells
muscle fibres
no cells
Hydra reproduces by gemmation (budding) when
Plenty of food is present
Pond dries up
Water becomes muddy
Hydra is alone
Polymorphic coelentrates are the members of the class
hydrozoa
scyphozoa
actinozoa
all of these
The larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
Polymorphism is found in
Hydra
Aleyonium
Aurelia
Physalia
Hydra prevents self fertilization by being
protogynous
hermaphrodite
monoecious
protandrous
The testes of hydra are located
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
Green Hydra is
Hydra vulgaris
Chlorohydra viridisma
Hydra oligaetis
None of these
The mesoglea present in Hydra in between epidermis and gastrodermis is
non-cellular and jelly like material
cellular jelly like material containing sensory cells
cellular jelly like material containing nerve cells
both (a) and (c)
Hydra respires through
mesoglea
general surface
pellicle
gastrodermis
Hydra reproduces by budding when
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
Tentaculocysts in Obelia are meant for
locomotion
balancing
swimming
reproduction
Rhopalia are the sense organs in medusa belonging to the class
hydrozoa
scyphozoa
actinozoa
all of these
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
Brain coral is
Fungia
Hydra
Meandria
Tubipora
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular
A chitinous material is present in the
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
Polymorphism is best defined as the occurrence of
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
Nematocytes are the specialised cells found in the members of the phylum
porifera
coelentrata
annelida
platyhelminthes
Body wall of coelentrates is described as
diploblastic
integument
multicellular
triploblastic
Most favourite food of Hydra is
bacteria
water fleas
tadpoles
fishes
Which one is found in Hydra
Metabolism
Metamerism
Melting
Metamorphosis
The poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin
Pueumatophore is present in
Tubularia
Obelia
Hydra
Physalia
In Hydra, the gastrodermis is composed of
musculo-epithelial cells
musculo-nutritive cells
sensory cells
cniboblasts