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Sponges & Cnidarians

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on 7 April 2014

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Transcript of Sponges & Cnidarians

How do sponges reproduce?
Fun Facts
some sponges can grow up to 10 feet wide.
a new sponge is found every year
sponges do not have organs.
household sponges are designed by sea sponges
Where do sponges live?
Do sponges eat?
What is a Sponge?
Sponges & Cnidarians
Anatomy of Sponge
What happens if part of a sponge is cut off?
Sponges are
animals
. They come in
several
colors. They can be
small

or they can grow taller than a
human
.
Most sponges live in
sea
water. But some live in
fresh
water. They
attach
themselves to the ocean floor.
The holdfast is at the
bottom
of the sponge this is where they attach to the
ocean
floor or rocks. The
epidermis
is the skin of the sponge. The water flows in to the pores and comes
OUT
the ossculum.
Sponges are
filter

feeders
. They eat by
straining
small organism and plankton from the water.


The sponge has the ability to
regenerate
or grow back if it is cut off. This makes the sponge one of the
toughest
animals. This is an example of
budding
.
The sponges can reproduce
asexually
and
sexually
. The way they do it asexually is by
budding
which is when a
piece
breaks off and forms a new sponge. The way they
sexually
reproduce is the male releases sperm which floats to the female.

Types of sponges
vase sponge
Tube sponge
Red tree sponge
yellow sponge
What are Cnidarians?
Cnidarians are animals with stinging cells located in their
tentacles
. They come in many
shapes
and colors. Most
appear
translucent.
Where do cnidarians live?
Most cnidarians live in
salty
water from Australia to the
Arctic
. A few can be found in
fresh
water in New Zealand.
Anatomy of Cnidarian.
The basic forms of the cnidarians are the
polyp
and the
medusa
both forms have tentacles, mouth,
epidermis
, and digestive system.
The cnidarians have no heart or brains yet they have been living for 650 millions year.
How do cnidarians reproduce?
They can reproduce
asexually
and
sexually
. The polyp form uses
budding
to reproduce asexually like the sponge. The
medusa
form uses sexual reproduction by producing eggs or
sperm
which is fertilized.
Regeneration of a Cnidarians
The cnidarians have the ability to
regenerate
. They can regrow a cut off structure within
2-4
days. Even if you cut it into
20
fragments each fragment will regenerate a complete polyp.
Different kinds of Cnidarians
coral
Jellyfish
Hydroids
Anemones
Work cited
www.youtube.com
dev.biologists.org
marinelife.about.com
www.enchantedlearning.com
www.ucmp.berkeley.edu
animals.about.com
w3.shorecrest.org
Fun Facts about Cnidarians
The biggest jelly fish was 8 feet in diameter and its tentacles were as long as half a football field.
The amount of venom found in Box jellyfish can kill about 60 people.
Full transcript