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
Correct Answer :
B. both parts make up the loss and form two new individuals
Related Questions
Polymorphic coelentrates are the members of the class
hydrozoa
scyphozoa
actinozoa
all of these
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular
The number of tentacles in Hydra is
24
610
1040
4050
A hydranth is
Blastostyle of Obelia
Gonad of Hydra
Medusa of Obelia
Polyp of Obelia
In Hydra, the absence of circulatory system is fulfilled by
ectoderm
endoderm
mesoglea
coelenteron
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)
Polymorphism is best defined as the occurrence of
several types of organ-systems in an individual
different kinds of larval forms in the life history of an animal
different functions performed by a single kind of organism
several different types of individuals in a species
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 is negatively chemotropic because it
prefers weak light
moves away from strong light
avoids chlorinated water
moves to water of low temperature
A Hydra usually possess
single testis and many ovaries
single ovary and many testes
one testis and one ovary
many testes and many ovaries
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
In Hydra, the nematocysts are abundant on
upper part
middle part
tentacles
lower part
Ephyra is the larval form of
Sea anemone
Aurelia
Obelia
Hydra
The first invertebrates to develop a true nervous system are
sponges
coelenterates
annelids
arthropods
Pueumatophore is present in
Tubularia
Obelia
Hydra
Physalia
Hydra reproduces by budding when
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
In Hydra, the gastrodermis is composed of
musculo-epithelial cells
musculo-nutritive cells
sensory cells
cniboblasts
In Hydra, buds always arise at
the hypostome
the junction of hypostome and stomach
in junction of stomach and stalk
the stomach
Most favourite food of Hydra is
bacteria
water fleas
tadpoles
fishes
Polymorphism is found in
Hydra
Aleyonium
Aurelia
Physalia
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
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
Brain coral is
Fungia
Hydra
Meandria
Tubipora
Hydra prevents self fertilization by being
protogynous
hermaphrodite
monoecious
protandrous
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 structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?
Endodermal cells
Mouth
Nematocysts
Tentacles
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
The mouth opens into a large single cavity in Hydra
coelom
enterocoel
pseudocoel
coelenteron
Hydra respires through
mesoglea
general surface
pellicle
gastrodermis