4. STINGING CELL
Specialized Cell is Cnidocyte that contain stinging
organelle
Nematocyst.
Nematocyst – has barbed and poisonous
thread. They produced toxin when discharged, they
help in the capture of prey or for defense
6. How to Soothe a Jellyfish Sting
1. REMAIN CALM! THERE
ARE ONLY A FEW JELLY FISH
WHOSE STING IS DEADLY
OR POTENTIALLY DEADLY.
PANICKING WOULD BE
UNHELPFUL.
7. 2. Get out of the
water! Jellyfish
stings can be
extremely painful
and you could
lose your ability
to swim
8. 3. Remove stingers by
applying shaving foam
to the sting area.
Scrape the skin closely
with a razor, knife blade,
or credit card. If you don't
have a plastic card, rub
sand over it to dislodge
the stingers and rinse it
off in salt water
9. 4. Deactivate the
remaining stingers. In
the case of a plain old
jellyfish sting, blot or pour
3-10% percent acetic
acid solution (white
vinegar) on the sting with
a clean cloth.
10. 5. Remove any venom in the
skin by applying a paste of
baking soda and water and
using a cloth covering. If
possible, reapply paste every
15-20 minutes.
11. 6. Take a very hot shower. A
15-20 minute hot shower can
deactivate the venom of some
jellyfish
12. 7. Soothe any remaining
skin irritations with overthe-counter antihistamine
pills.
13. 8. Get medical care if the
victim is experiencing any
symptoms worse than
skin irritation or has
trouble breathing.
14. 10. Severe stings need to be
wrapped after treatment to
keep them from getting
infected
19. Tentacles – contain sting cell
use in capturing prey
Oral arm – Hold the prey then
pass out in the mouth
Mouth – serve for food
entrance, metabolic waste exit
and passageway of gametes.
20. Nerve Net – nerve cells
interconnect to form a nerve
net below the epidermis
Epidermis – outer covering
of Cnidaria
Gonads – responsible for
production of gametes
22. The life cycle of Cnidaria include two phases:
When there is an alteration of Generation
Medusa – the sexual phase
Polyp – asexual phase
23.
Polyp – has mouth on the dorsal surface and tentacles
that point upward
Medusa – has a mouth on the ventral surface and
tentacles that point downward
26. The adult male and female sea jellies releases gametes
2.
Fertilization occur in the water. Zygote will form that
eventually develop into a planula
3. The planula will eventually settle and attaches to a firm
surface. The planula then develops into a polyp with a
mouth and tentacles on its unattached end. The polyp
will develop a stack of medusa that will bud off.
4. The polyp will bud off immature sea jelly or ephyra then it
will develop into an adult sea jelly.
1.
31. HYDROZOA
Cnidaria with polyp dominant
One of the few fresh water
cnidaria
They are also found in
attached to underwater plant
or rocks, mostly in lakes and
ponds.
Hydra
Obelia
32. ANTHOZOA
Stony coral, with no medusae
have a calcium carbonate
exoskeleton that contribute
greatly building of coral reef.
Fungia
Corallium
35. THE REEF DECREASES THE FORCE OF THE INCOMING
WAVES, RESULTING IN PEACERFUL WATER AT THE SHORE
36. SEA CORALS ARE GOOD INDICATOR OF ENVIRONMENTAL
CHANGES. SEA CORALS ARE VERY SENSITIVE TO SUCH FACTOR
AS WATER POLLUTION
37. Multiple Choice. Choose the best answer in the following question
1. The jelly like layer in the cnidaria body wall
a.Nematocyst
c. Mesoglea
b. Mesohyl
d.Gastrocoel
2.The asexual phase of cnidaria
a.Polyp
c. Both polyp and medusa
c. Medusa
d. None
3.What do you call the free living larva of Cnidaria?
a.Planula b. Clydippids c.Nymphs
d. Lanula
4.Which of the following is NOT a Cnidarian
Characterisitic?
a.Contain stinging cell c. Didermic
b.Triploblastic
d.Sac Body Plan
5.Halyclystus belong to what class?
a.Staurozoa
c. Hydrozoa
b.Cubozoa
d. Anthozoa