The small green alga that lives inside Hydra is called
Zoochlorella
Chlamydomonas
Euglena
None of these
Correct Answer :
A. Zoochlorella
Related Questions
Musculo-glandular cells are found in hydra
on the tentacles
on the hypostome
on the basal disc
in the gastrodermis
The first invertebrates to develop a true nervous system are
sponges
coelenterates
annelids
arthropods
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
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
A coelentrate, commonly known as fresh water polyp is
Hydra
Obelia
Physalia
Acerelia
Rhopalia are the sense organs in medusa belonging to the class
hydrozoa
scyphozoa
actinozoa
all of these
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
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 poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin
What structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?
Endodermal cells
Mouth
Nematocysts
Tentacles
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
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
Which one is found in Hydra
Metabolism
Metamerism
Melting
Metamorphosis
Coelenteron in Hydra serves the purpose of
digestion and circulation
digestion and storage
excretion and digestion
circulation and storage
Division of labour on morphological basis is well exemplified by
Hydra
Obelia
Monkey
Elephant
The mesoglea of Hydra contains
nerve cells
sensory cells
muscle fibres
no cells
The tentacles of Hydra are
pinnate
hollow
solid
frilled
In Hydra, the gastrodermis is composed of
musculo-epithelial cells
musculo-nutritive cells
sensory cells
cniboblasts
Brain coral is
Fungia
Hydra
Meandria
Tubipora
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage
Hydra reproduces by budding when
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
Green Hydra is
Hydra vulgaris
Chlorohydra viridisma
Hydra oligaetis
None of these
A chitinous material is present in the
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
A Hydra usually possess
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
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
The mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
Body wall of coelentrates is described as
diploblastic
integument
multicellular
triploblastic
Among coelenterates medusoid individuals are absent in members of the class
hydrozoa
scyphozoa
anthozoa
all the three