The nematocysts develop from
musculo-epithelial cells
interstitial cells
digestive cells
nerve cell
Correct Answer :
B. interstitial cells
Related Questions
Hydra is
marine, radial, symmetrical and diploblastic
fresh water, biradial, symmetrical and triploblastic
fresh water, radial, symmetrical and diploblastic
marine, radial, symmetrical and triploblastic
In Hydra, the absence of circulatory system is fulfilled by
ectoderm
endoderm
mesoglea
coelenteron
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
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)
The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
The nematocysts which are mainly used for defense and offense and which tightly coil around the prey are
steptoline or atrichous
streptoline or holotrichous
volvent or desmonemes
penetrant or stenoteles
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
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 put under phylum coelentrata because it has
tentacles
cnidoblasts
hypostome
interstitial cells
Tentacles of Hydra help in
locomotion
food capturing
locomotion and food capturing
respiration
The small green alga that lives inside Hydra is called
Zoochlorella
Chlamydomonas
Euglena
None of these
Rhopalia are the sense organs in medusa belonging to the class
hydrozoa
scyphozoa
actinozoa
all of these
Coral reef formation is mainly related to
sponges
anthozoans
molluscs
hydrozoans
Ctenophores generally exhibit
bilateral symmetry
radial symmetry
asymmetry
spherical symmetry
What structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?
Endodermal cells
Mouth
Nematocysts
Tentacles
Strobilization is the characteristic feature of
Aurelia
Hydra
Metridium
Physalia
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
Division of labour on morphological basis is well exemplified by
Hydra
Obelia
Monkey
Elephant
Nematocytes are the specialised cells found in the members of the phylum
porifera
coelentrata
annelida
platyhelminthes
The scientific name of organ pipe coral is
Tubipora
Astrangia
Meandra
Aeropora
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
Nematocysts of Hydra are important for
cataching prey
paralysing prey
testing the food
testing the water
The poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin
The number of tentacles in Hydra is
24
610
1040
4050
Digestion in Hydra is
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
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
Musculo-glandular cells are found in hydra
on the tentacles
on the hypostome
on the basal disc
in the gastrodermis
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
Pueumatophore is present in
Tubularia
Obelia
Hydra
Physalia