Characteristics of Cnidarians
This is another word for arms of a cnidarian.
Tentacles
False. They float with ease.
What do sea anemones look like?
Underwater flowers
Fill in the blank.
One of the most ____________________ structures in nature.
Spectacular
False
True or False. Cnidarians feel a stimulus throughout the body.
True. When one part of the body is stimulated, the whole animal responds.
What are the tentacles used for?
For defense or getting food.
How are sea anemones like jellyfish?
They possess stinging tentacles, radial symmetry, and a nerve net.
What are the two types of corals?
Stony (hard) and soft
What is the most dangerous hydroid?
Portuguese Man-of-War
What do cnidarians have instead of a brain?
A nerve net
The tentacles hang from what structure?
The medusa
How are they attached to rock?
By a muscular foot.
What makes corals?
A tiny organism that can only be seen under a microscope.
What is dangerous about hydroids?
Their tentacles sting and are painful and sometimes fatal.
Radial symmetry
How do jellyfish move? There are two different ways.
The muscles in the medusa contract in a rhythmic fashion, causing them to pulsate gently through the water.
Some just float
False. They can also inflict painful stings just like jellyfish.
What are stony corals made of?
Limestone (calcium carbonate)
Where do hydroids live?
In intertidal zones
What kind of digestive tract do cnidarians have?
Sac-like
Why do jellyfish get deposited on sandy beaches?
They are weak swimmers
What is the term when organisms of different species have a mutually beneficial relationship?
What are soft corals made of?
A fibrous protein, which gives it flexibility
What are hydroids made up of?
Several polyps (they are colonial) that function together as a single organism