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
Correct Answer :
B. below the tentacles
Related Questions
In Hydra, the nematocysts are abundant on
upper part
middle part
tentacles
lower part
Hydra has no special structure for
attachment
respiration
food capturing
offense
Enteron is divided by mesentries in
Aurelia
Sea anemone
Obelia
Hydra
Hydra is
marine, radial, symmetrical and diploblastic
fresh water, biradial, symmetrical and triploblastic
fresh water, radial, symmetrical and diploblastic
marine, radial, symmetrical and triploblastic
Polymorphism is found in
Hydra
Aleyonium
Aurelia
Physalia
Hydra reproduces by gemmation (budding) when
Plenty of food is present
Pond dries up
Water becomes muddy
Hydra is alone
The body wall of Hydra consists of
ecotderm and endoderm
ectoderm and mesoderm
ectoderm, mesoderm and endoderm
epidermis, mesoglea and endoderm
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)
Which of the following tissue is absent in Hydra ?
Connective tissue
Epithelial tissue
Muscular tissue
Nervous tissue
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 tentacles of Hydra are
pinnate
hollow
solid
frilled
Hydra reproduces by budding when
plenty of food is present
pond is going dry
Hydra is alone
water becomes muddy
If nematocysts are absent in Hydra, which is affected
Locomotion
Predation
Both (a) and (b)
Reproduction
The scientific name of organ pipe coral is
Tubipora
Astrangia
Meandra
Aeropora
Pueumatophore is present in
Tubularia
Obelia
Hydra
Physalia
Coral reef formation is mainly related to
sponges
anthozoans
molluscs
hydrozoans
Six septa or six mesenteries are characteristic of
Aurelia
Sea anemone
Obelia
Hydra
Most favourite food of Hydra is
bacteria
water fleas
tadpoles
fishes
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
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 chitinous material is present in the
coenosarc of Obelia
perisarc of Obelia
body wall of Sea anemone
umbrella of Aurelia
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
The mesoglea in Hydra is traversed by
sensory cells
nerve cells
interstitial cells
all of these
Cindom is a
battery of nematocysts
group of nematocysts
armed thread
none of these
Nutritionally Hydra is
saprozoic
herbivorous
insectivorous
carnivorous
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
The nematocysts develop from
musculo-epithelial cells
interstitial cells
digestive cells
nerve cell
Which of the following animals has a nervous system but no brain ?
Earthworm
Hydra
Amoeba
Cockroach
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
Division of labour on morphological basis is well exemplified by
Hydra
Obelia
Monkey
Elephant