Hydra respires through
mesoglea
general surface
pellicle
gastrodermis
Correct Answer :
B. general surface
Related Questions
Hydra respires through
mesoglea
general surface
pellicle
gastrodermis
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
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
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
Digestion in Hydra is
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
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)
"Portuguese Man of War" is the common name for
Aurelia
Metridium
Physalia
Tubipora
Rhopalia are the sense organs in medusa belonging to the class
hydrozoa
scyphozoa
actinozoa
all of these
The small green alga that lives inside Hydra is called
Zoochlorella
Chlamydomonas
Euglena
None of these
Hydra is put under phylum coelentrata because it has
tentacles
cnidoblasts
hypostome
interstitial cells
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
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
In Hydra, the absence of circulatory system is fulfilled by
ectoderm
endoderm
mesoglea
coelenteron
The first invertebrates to develop a true nervous system are
sponges
coelenterates
annelids
arthropods
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage
The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
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
A Hydra usually possess
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
A chitinous material is present in the
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
The poisonous fluid present in the nematocysts of Hydra is
toxin
venom
hypnotoxin
haematin
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
Six septa or six mesenteries are characteristic of
Aurelia
Sea anemone
Obelia
Hydra
Green Hydra is
Hydra vulgaris
Chlorohydra viridisma
Hydra oligaetis
None of these
Nematocysts of Hydra are important for
cataching prey
paralysing prey
testing the food
testing the water
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 mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
Musculo-glandular cells are found in hydra
on the tentacles
on the hypostome
on the basal disc
in the gastrodermis
What structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?
Endodermal cells
Mouth
Nematocysts
Tentacles