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
Correct Answer :
D. several different types of individuals in a species
Related Questions
The tentacles of Hydra are
pinnate
hollow
solid
frilled
In Hydra, the absence of circulatory system is fulfilled by
ectoderm
endoderm
mesoglea
coelenteron
Enteron is divided by mesentries in
Aurelia
Sea anemone
Obelia
Hydra
In Hydra, buds always arise at
the hypostome
the junction of hypostome and stomach
in junction of stomach and stalk
the stomach
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
Coelenteron in Hydra serves the purpose of
digestion and circulation
digestion and storage
excretion and digestion
circulation and storage
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
Hydra responds to a strong mechanical stimulus such as agitating the surface of water by
somersaulting
contracting a part or whole of its body
walking away
looping
Nematocytes are the specialised cells found in the members of the phylum
porifera
coelentrata
annelida
platyhelminthes
Six septa or six mesenteries are characteristic of
Aurelia
Sea anemone
Obelia
Hydra
Body wall of coelentrates is described as
diploblastic
integument
multicellular
triploblastic
The mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
The mesoglea of Hydra contains
nerve cells
sensory cells
muscle fibres
no cells
A coelentrate, commonly known as fresh water polyp is
Hydra
Obelia
Physalia
Acerelia
Ephyra is the larval form of
Sea anemone
Aurelia
Obelia
Hydra
Which one is found in Hydra
Metabolism
Metamerism
Melting
Metamorphosis
Rhopalia are the sense organs in medusa belonging to the class
hydrozoa
scyphozoa
actinozoa
all of these
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
Green Hydra is
Hydra vulgaris
Chlorohydra viridisma
Hydra oligaetis
None of these
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
Nematocysts of Hydra are important for
cataching prey
paralysing prey
testing the food
testing the water
Hydra reproduces by gemmation (budding) when
Plenty of food is present
Pond dries up
Water becomes muddy
Hydra is alone
Hydra is put under phylum coelentrata because it has
tentacles
cnidoblasts
hypostome
interstitial cells
A hydranth is
Blastostyle of Obelia
Gonad of Hydra
Medusa of Obelia
Polyp of Obelia
The nematocysts develop from
musculo-epithelial cells
interstitial cells
digestive cells
nerve cell
Hydra has no special structure for
attachment
respiration
food capturing
offense
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular
The number of tentacles in Hydra is
24
610
1040
4050
In jelly fishes, the adult is always
polypoid
medusoid
polymorphic
hydroid