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)
Correct Answer :
A. non-cellular and jelly like material
Related Questions
Polymorphism is found in
Hydra
Aleyonium
Aurelia
Physalia
Coral reef formation is mainly related to
sponges
anthozoans
molluscs
hydrozoans
Pueumatophore is present in
Tubularia
Obelia
Hydra
Physalia
Strobilization is the characteristic feature of
Aurelia
Hydra
Metridium
Physalia
The testes of hydra are located
below the ovaries
below the tentacles
further down the tentacles to occupy central position of the body
anywhere on the body between tentacles and adhesive disc
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
Cindom is a
battery of nematocysts
group of nematocysts
armed thread
none of these
Body wall of coelentrates is described as
diploblastic
integument
multicellular
triploblastic
Coelenteron in Hydra serves the purpose of
digestion and circulation
digestion and storage
excretion and digestion
circulation and storage
The larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
Tentacles of Hydra help in
locomotion
food capturing
locomotion and food capturing
respiration
Brain coral is
Fungia
Hydra
Meandria
Tubipora
Nematocytes are the specialised cells found in the members of the phylum
porifera
coelentrata
annelida
platyhelminthes
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)
Enteron is divided by mesentries in
Aurelia
Sea anemone
Obelia
Hydra
A coelentrate, commonly known as fresh water polyp is
Hydra
Obelia
Physalia
Acerelia
Tentaculocysts in Obelia are meant for
locomotion
balancing
swimming
reproduction
Most favourite food of Hydra is
bacteria
water fleas
tadpoles
fishes
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)
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
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
Hydra has no special structure for
attachment
respiration
food capturing
offense
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
The number of tentacles in Hydra is
24
610
1040
4050
The body wall of Hydra consists of
ecotderm and endoderm
ectoderm and mesoderm
ectoderm, mesoderm and endoderm
epidermis, mesoglea and endoderm
Polymorphic coelentrates are the members of the class
hydrozoa
scyphozoa
actinozoa
all 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
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
A Hydra usually possess
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular