Cnidarians

What Type of symmetry do cnidarians have?

Radial

What is another name for nematocyst?

Stinging cells

How many tissue layers do cnidarians have?

2

True or False, cnidarians have a very complex muscle system. 

False

What percent of a cnidarians body is made of water?

95%

What are 2 major different types of corals?

Soft and hard corals

True, or False, some cnidarians can lie to 100 years.

True

Do cnidarians have a brain? 

No

The Portuguese man o war is which class of cnidarian? 

Hydrozoan

Corals have what living in their tissue?

Zooxanthellae

Do cnidarians have a nerve net?

Yes

Which of the 2 types of corals build reefs?

Hard / Stoney

Can jellyfish sting you after it washes to shore?

Yes

Which of the classes of cnidarian are only found in the polyp stage?

Anthozoans

This class of cnidarian can be found in a polyp and medusa stage.

Scyphozoan and cubozoan

A sea anemone is found in which stage?

Polyp stage

Name 3 different types of cnidarians

jellyfish, coral, and sea anemone

What is the main characteristic of all cnidarians?

Tentacles with stinging cells

How many species of jellyfish are there?

Over 500

Where in the ocean would you be most likely to find sea jellies?

Shallow, coastal waters

What is created after the process of strobilation in the sea jelly life cycle?

Ephyra

A ropallia is what part of a jellyfish?

eyes, light / dark

What is the top of the of sea anemone called?

Oral disc

Corals that have zooxanthellae are what type of coral?

Hermatypic

With what does broadcast spawning occur?

With the lunar cycle

Corals with polyps less than 1 mm in diameter are called what type of coral?

Small polyped stoney corals

How much nutrients do corals get from zooxanthellae?

60-90%

How do you identify a stoney coral? 

6 or multiples of 6 

How many corals do soft corals have?

8

What is the defense mechanism for soft corals? 

Toxins

What is the optimal water temperature for corals? 

77-86 degrees

What type of coral reef is the oldest?

Fringing

What type of coral reef is the youngest?

Atoll

Feathery extensions of soft corals are called what?

Pinuels

What are 2 exmaples of anthozoans?

True corals, anemones, and sea pens

5 threats of a coral reef.

Bleaching, blast fishing, cyanide fishing, anchor damage, and oil suffocation.