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
Correct Answer :
D. penetrant or stenoteles
Related Questions
Hydra is negatively chemotropic because it
prefers weak light
moves away from strong light
avoids chlorinated water
moves to water of low temperature
In Hydra, the gastrodermis is composed of
musculo-epithelial cells
musculo-nutritive cells
sensory cells
cniboblasts
Tentaculocysts in Obelia are meant for
locomotion
balancing
swimming
reproduction
The small green alga that lives inside Hydra is called
Zoochlorella
Chlamydomonas
Euglena
None of these
Tentacles of Hydra help in
locomotion
food capturing
locomotion and food capturing
respiration
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
Polymorphism is found in
Hydra
Aleyonium
Aurelia
Physalia
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 mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular
Which one is found in Hydra
Metabolism
Metamerism
Melting
Metamorphosis
The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
The larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
A hydranth is
Blastostyle of Obelia
Gonad of Hydra
Medusa of Obelia
Polyp of Obelia
The scientific name of organ pipe coral is
Tubipora
Astrangia
Meandra
Aeropora
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
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 reproduces by budding when
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage
Hydra is put under phylum coelentrata because it has
tentacles
cnidoblasts
hypostome
interstitial cells
The nematocysts develop from
musculo-epithelial cells
interstitial cells
digestive cells
nerve cell
"Portuguese Man of War" is the common name for
Aurelia
Metridium
Physalia
Tubipora
Most favourite food of Hydra is
bacteria
water fleas
tadpoles
fishes
Digestion in Hydra is
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
In Hydra, buds always arise at
the hypostome
the junction of hypostome and stomach
in junction of stomach and stalk
the stomach
Ephyra is the larval form of
Sea anemone
Aurelia
Obelia
Hydra
The mesoglea of Hydra contains
nerve cells
sensory cells
muscle fibres
no cells
Which of the following tissue is absent in Hydra ?
Connective tissue
Epithelial tissue
Muscular tissue
Nervous tissue
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach