Rhopalia are the sense organs in medusa belonging to the class
hydrozoa
scyphozoa
actinozoa
all of these
Correct Answer :
B. scyphozoa
Related Questions
A coelentrate, commonly known as fresh water polyp is
Hydra
Obelia
Physalia
Acerelia
In jelly fishes, the adult is always
polypoid
medusoid
polymorphic
hydroid
Six septa or six mesenteries are characteristic of
Aurelia
Sea anemone
Obelia
Hydra
What is common between Hydra and Obelia ?
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
Hydra is negatively chemotropic because it
prefers weak light
moves away from strong light
avoids chlorinated water
moves to water of low temperature
"Portuguese Man of War" is the common name for
Aurelia
Metridium
Physalia
Tubipora
Hydra has no special structure for
attachment
respiration
food capturing
offense
Green Hydra is
Hydra vulgaris
Chlorohydra viridisma
Hydra oligaetis
None of these
Musculo-glandular cells are found in hydra
on the tentacles
on the hypostome
on the basal disc
in the gastrodermis
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
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
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
The larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
Hydra reproduces by gemmation (budding) when
Plenty of food is present
Pond dries up
Water becomes muddy
Hydra is alone
A piece of Hydra will regenerate into a full Hydra if it contains a part of
epidermis alone
gastrodermis alone
both (a) and (b)
(a), (b) and tentacles
The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
Tentaculocysts in Obelia are meant for
locomotion
balancing
swimming
reproduction
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
Rhopalia are the sense organs in medusa belonging to the class
hydrozoa
scyphozoa
actinozoa
all of these
Which one is found in Hydra
Metabolism
Metamerism
Melting
Metamorphosis
Strobilization is the characteristic feature of
Aurelia
Hydra
Metridium
Physalia
The poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin
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 number of tentacles in Hydra is
24
610
1040
4050
In Hydra, the absence of circulatory system is fulfilled by
ectoderm
endoderm
mesoglea
coelenteron
Body wall of coelentrates is described as
diploblastic
integument
multicellular
triploblastic
Ephyra is the larval form of
Sea anemone
Aurelia
Obelia
Hydra
A Hydra usually possess
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
The flagella of food-absorbing cells in hydra aid in
stirring up the digestive fluid in the digestive cavity
engulfing food particles
engulfing semi-digested particles inside food- absorbing cells
none of these