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
Correct Answer :
B. absence of nematocysts
Related Questions
A hydranth is
Blastostyle of Obelia
Gonad of Hydra
Medusa of Obelia
Polyp of Obelia
The mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
The larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
The tentacles of Hydra are
pinnate
hollow
solid
frilled
The scientific name of organ pipe coral is
Tubipora
Astrangia
Meandra
Aeropora
Hydra prevents self fertilization by being
protogynous
hermaphrodite
monoecious
protandrous
The mesoglea of Hydra contains
nerve cells
sensory cells
muscle fibres
no cells
The nematocysts develop from
musculo-epithelial cells
interstitial cells
digestive cells
nerve cell
A chitinous material is present in the
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
Among coelenterates medusoid individuals are absent in members of the class
hydrozoa
scyphozoa
anthozoa
all the three
If a Hydra is cut into two pieces, it is noted that
both parts die
both parts make up the loss and form two new individuals
both parts live independently as they are
none of these
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
What structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?
Endodermal cells
Mouth
Nematocysts
Tentacles
Hydra is put under phylum coelentrata because it has
tentacles
cnidoblasts
hypostome
interstitial cells
Nematocytes are the specialised cells found in the members of the phylum
porifera
coelentrata
annelida
platyhelminthes
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
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular
In jelly fishes, the adult is always
polypoid
medusoid
polymorphic
hydroid
Nematocysts of Hydra are important for
cataching prey
paralysing prey
testing the food
testing the water
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
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
Hydra respires through
mesoglea
general surface
pellicle
gastrodermis
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
Brain coral is
Fungia
Hydra
Meandria
Tubipora
Ephyra is the larval form of
Sea anemone
Aurelia
Obelia
Hydra
Digestion in Hydra is
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
Hydra is
marine, radial, symmetrical and diploblastic
fresh water, biradial, symmetrical and triploblastic
fresh water, radial, symmetrical and diploblastic
marine, radial, symmetrical and triploblastic
The first invertebrates to develop a true nervous system are
sponges
coelenterates
annelids
arthropods
The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
Coelenteron in Hydra serves the purpose of
digestion and circulation
digestion and storage
excretion and digestion
circulation and storage