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Sponges & Cnidarians
Transcript of Sponges & Cnidarians
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?
. They come in
colors. They can be
or they can grow taller than a
Most sponges live in
water. But some live in
themselves to the ocean floor.
The holdfast is at the
of the sponge this is where they attach to the
floor or rocks. The
is the skin of the sponge. The water flows in to the pores and comes
. They eat by
small organism and plankton from the water.
The sponge has the ability to
or grow back if it is cut off. This makes the sponge one of the
animals. This is an example of
The sponges can reproduce
. The way they do it asexually is by
which is when a
breaks off and forms a new sponge. The way they
reproduce is the male releases sperm which floats to the female.
Types of sponges
Red tree sponge
What are Cnidarians?
Cnidarians are animals with stinging cells located in their
. They come in many
and colors. Most
Where do cnidarians live?
Most cnidarians live in
water from Australia to the
. A few can be found in
water in New Zealand.
Anatomy of Cnidarian.
The basic forms of the cnidarians are the
both forms have tentacles, mouth,
, 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
. The polyp form uses
to reproduce asexually like the sponge. The
form uses sexual reproduction by producing eggs or
which is fertilized.
Regeneration of a Cnidarians
The cnidarians have the ability to
. They can regrow a cut off structure within
days. Even if you cut it into
fragments each fragment will regenerate a complete polyp.
Different kinds of Cnidarians
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.