Biology
11
Name:
__________________
Phylum
Cnidaria
Worksheet
1. Label
the
diagram
of
hydra
using
the
following
terms:
mouth,
tentacle,
gastrovascular
cavity
(GVC),
ovary/teste,
bud,
cnidocyte,
nematocyst,
and
basal
disk.
Label
and
colour
code
the
following
cell/germ
layers:
ectoderm
endoderm
mesoglea
2. 3. Members
of
the
Phylum
Cnidaria
exhibit
____________
symmetry.
4. Many
members
of
the
Phylum
Cnidaria
have
a
type
of
alternation
of
generations
between
two
body
forms
called
the
polyp
and
the
medusa.
Use
the
following
words
to
fill
in
the
blanks
below:
sessile,
motile,
sexual,
asexual,
hydra,
jellyfish,
and
dimorphism.
The
polyp
body
form
is
generally
responsible
for
______________
reproduction.
An
example
of
a
cnidarians
with
a
polyp
body
form
is
______________.
The
polyp
normally
remains
fixed
to
one
place
and
is
therefore
described
as
________________.
The
medusa
body
form
is
responsible
for
_________________
reproduction.
An
example
of
a
medusa
body
form
is
a
___________________.
The
medusa
is
free‐swimming
and
is
therefore
described
as
____________.
The
presence
of
both
polyp
and
medusa
body
forms
in
one
life
cycle
is
called
________________________.
5. A
cnidarian
has
a
(tissue/organ)
_____________
level
of
organization
with
_____
(2/3)
germ
(cell)
layers
called
the
__________________
and
the
____________________.
The
polyp
stage
produces
the
______________
stage,
which
in
turn
produces
the
gametes
‐
_______
and
____________.
6. The
diagrams
to
the
right
are
___________________.
The
function
of
this
unique
cnidarian
structure
is:
___________________________________________
___________________________________________
___________________________________________
7. Describe
the
life
functions
of
a
typical
jellyfish
by
completing
the
following
table.
(You
may
use
point
form
and/or
diagrams
to
complete
your
description)
Ingestion:
taking
in
food
Digestion:
breaking
down
its
food
into
usable
nutrients
Elimination:
of
undigested
food
wastes
Respiration:
taking
in
of
O2
and
getting
rid
of
CO2
Circulation:
transporting
nutrients
to
all
of
its
cells
Excretion:
of
metabolic
wastes
Sexual
Reproduction:
reproduction
using
gametes
Asexual
Reproduction:
reproduction
without
using
gametes
Nervous
System:
coordinating
movement
and
responding
to
stimuli
Motility:
8. Explain
the
evolutionary
significance
of
the
multicellular
life
form
of
members
of
the
Phylum
Cnidaria.
(Compare
to
the
unicellular
form
of
bacteria
and
protists
and
the
colonial
life
form
of
members
of
the
Phylum
Porifera.)
____________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
9. List
and
describe
at
least
three
ecological
(environmental)
roles
of
members
of
the
Phylum
Cnidaria.
_______________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
10.What
is
the
advantage
of
a
motile
form
in
the
life
cycle
of
many
cnidarians?
_________________________________________________
___________________________________________________________