In jelly fishes, the adult is always
polypoid
medusoid
polymorphic
hydroid
Correct Answer :
B. medusoid
Related Questions
Enteron is divided by mesentries in
Aurelia
Sea anemone
Obelia
Hydra
In jelly fishes, the adult is always
polypoid
medusoid
polymorphic
hydroid
The mesoglea of Hydra contains
nerve cells
sensory cells
muscle fibres
no cells
Division of labour on morphological basis is well exemplified by
Hydra
Obelia
Monkey
Elephant
A chitinous material is present in the
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
The mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
Musculo-glandular cells are found in hydra
on the tentacles
on the hypostome
on the basal disc
in the gastrodermis
The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
The first invertebrates to develop a true nervous system are
sponges
coelenterates
annelids
arthropods
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
Ctenophores generally exhibit
bilateral symmetry
radial symmetry
asymmetry
spherical symmetry
Among coelenterates medusoid individuals are absent in members of the class
hydrozoa
scyphozoa
anthozoa
all the three
A Hydra usually possess
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
Brain coral is
Fungia
Hydra
Meandria
Tubipora
The larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage
The small green alga that lives inside Hydra is called
Zoochlorella
Chlamydomonas
Euglena
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
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
Hydra is
marine, radial, symmetrical and diploblastic
fresh water, biradial, symmetrical and triploblastic
fresh water, radial, symmetrical and diploblastic
marine, radial, symmetrical and triploblastic
"Portuguese Man of War" is the common name for
Aurelia
Metridium
Physalia
Tubipora
Polymorphism is found in
Hydra
Aleyonium
Aurelia
Physalia
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
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
Communication between the enteron and exterior in coelentrates is through
mouth only
mouth and anus
large number of pores in the body wall
both (b) and (c)
Hydra is negatively chemotropic because it
prefers weak light
moves away from strong light
avoids chlorinated water
moves to water of low temperature
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
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 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
Most favourite food of Hydra is
bacteria
water fleas
tadpoles
fishes