The tentacles of Hydra are
pinnate
hollow
solid
frilled
Correct Answer :
B. hollow
Related Questions
In Hydra, buds always arise at
the hypostome
the junction of hypostome and stomach
in junction of stomach and stalk
the stomach
Ctenophores generally exhibit
bilateral symmetry
radial symmetry
asymmetry
spherical symmetry
Among coelenterates medusoid individuals are absent in members of the class
hydrozoa
scyphozoa
anthozoa
all the three
Digestion in Hydra is
intracellular
extracellular
first extracellular, then intracellular
first intracellular, then extracellular
Strobilization is the characteristic feature of
Aurelia
Hydra
Metridium
Physalia
Polymorphic coelentrates are the members of the class
hydrozoa
scyphozoa
actinozoa
all of these
The scientific name of organ pipe coral is
Tubipora
Astrangia
Meandra
Aeropora
Coelenteron of Hydra serves the double purpose of
digestion and circulation
digestion and storage
excretion and locomotion
circulation and storage
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
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 larva of Hydra is known as
hydrula
planula
tadpole
amphiblastula
Hydra prevents self fertilization by being
protogynous
hermaphrodite
monoecious
protandrous
The tentacles of Hydra are
pinnate
hollow
solid
frilled
The first invertebrates to develop a true nervous system are
sponges
coelenterates
annelids
arthropods
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 small green alga that lives inside Hydra is called
Zoochlorella
Chlamydomonas
Euglena
None 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
What structures in Hydra functionally correspond to the pseudopodia of Aamoeba ?
Endodermal cells
Mouth
Nematocysts
Tentacles
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
In jelly fishes, the adult is always
polypoid
medusoid
polymorphic
hydroid
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
Enteron is divided by mesentries in
Aurelia
Sea anemone
Obelia
Hydra
Six septa or six mesenteries are characteristic of
Aurelia
Sea anemone
Obelia
Hydra
Nematocysts of Hydra are important for
cataching prey
paralysing prey
testing the food
testing the water
In Hydra, the physiological division of labour is exhibited by
cellular layers
tissues
cell differentiation
organs
Polymorphism is found in
Hydra
Aleyonium
Aurelia
Physalia
The body of Hydra is
asymmetrical
bilaterally symmetrical
radially symmetrical
irregular
Brain coral is
Fungia
Hydra
Meandria
Tubipora
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)
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous