The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
Correct Answer :
A. sensory cells
Related Questions
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)
Hydra reproduces by budding when
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
The poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin
Hydra respires through
mesoglea
general surface
pellicle
gastrodermis
Strobilization is the characteristic feature of
Aurelia
Hydra
Metridium
Physalia
In Hydra, the absence of circulatory system is fulfilled by
ectoderm
endoderm
mesoglea
coelenteron
Six septa or six mesenteries are characteristic of
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
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
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
Most favourite food of Hydra is
bacteria
water fleas
tadpoles
fishes
Coral reef formation is mainly related to
sponges
anthozoans
molluscs
hydrozoans
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage
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
Hydra is negatively chemotropic because it
prefers weak light
moves away from strong light
avoids chlorinated water
moves to water of low temperature
Hydra has no special structure for
attachment
respiration
food capturing
offense
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular
In Hydra, the gastrodermis is composed of
musculo-epithelial cells
musculo-nutritive cells
sensory cells
cniboblasts
Division of labour on morphological basis is well exemplified by
Hydra
Obelia
Monkey
Elephant
The mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
Which of the following tissue is absent in Hydra ?
Connective tissue
Epithelial tissue
Muscular tissue
Nervous tissue
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)
Tentaculocysts in Obelia are meant for
locomotion
balancing
swimming
reproduction
Hydra reproduces by gemmation (budding) when
Plenty of food is present
Pond dries up
Water becomes muddy
Hydra is alone
Nematocysts of Hydra are important for
cataching prey
paralysing prey
testing the food
testing the water
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
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