The poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin
Correct Answer :
C. hypnotoxin
Related Questions
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
Cindom is a
battery of nematocysts
group of nematocysts
armed thread
none of these
Hydra prevents self fertilization by being
protogynous
hermaphrodite
monoecious
protandrous
The larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
In Hydra, buds always arise at
the hypostome
the junction of hypostome and stomach
in junction of stomach and stalk
the stomach
Musculo-glandular cells are found in hydra
on the tentacles
on the hypostome
on the basal disc
in the gastrodermis
Hydra reproduces by budding when
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
The mesoglea present in Hydra in between epidermis and gastrodermis is
non-cellular and jelly like material
cellular jelly like material containing sensory cells
cellular jelly like material containing nerve cells
both (a) and (c)
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
A chitinous material is present in the
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
Hydra is put under phylum coelentrata because it has
tentacles
cnidoblasts
hypostome
interstitial cells
Division of labour on morphological basis is well exemplified by
Hydra
Obelia
Monkey
Elephant
The number of tentacles in Hydra is
24
610
1040
4050
Nematocytes are the specialised cells found in the members of the phylum
porifera
coelentrata
annelida
platyhelminthes
In Hydra, the gastrodermis is composed of
musculo-epithelial cells
musculo-nutritive cells
sensory cells
cniboblasts
Which of the following tissue is absent in Hydra ?
Connective tissue
Epithelial tissue
Muscular tissue
Nervous tissue
Hydra is negatively chemotropic because it
prefers weak light
moves away from strong light
avoids chlorinated water
moves to water of low temperature
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
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
Body wall of coelentrates is described as
diploblastic
integument
multicellular
triploblastic
Six septa or six mesenteries are characteristic of
Aurelia
Sea anemone
Obelia
Hydra
Ephyra is the larval form of
Sea anemone
Aurelia
Obelia
Hydra
The mesoglea of Hydra contains
nerve cells
sensory cells
muscle fibres
no cells
Coelenteron in Hydra serves the purpose of
digestion and circulation
digestion and storage
excretion and digestion
circulation and storage
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage
In Hydra, the nematocysts are abundant on
upper part
middle part
tentacles
lower part
Enteron is divided by mesentries in
Aurelia
Sea anemone
Obelia
Hydra
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
The poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin