Hydra/Intro. to Cnidarians

In Cnidarians, where does digestion occur?

• spongocoel

• nematocyst

• gastrovascular cavity

• tentacles

A jellyfish is covered in an outer layer of cells called the epidermis. Within the epidermis is the ____________, which is the jelly-like interior of the animal.

• mesoglea

• gastrodermis

• epidermin

• tentacle

Name this body type.

• Medusa

• Polyp

Name this body type.

• Medusa

• Polyp

How are nervous responses in cnidarians controlled?

• by their gastrovascular cavity

• through the mesoglea

• by the nerve net

• through the filaments in their nematocysts

What type of cnidarian is pictured?

• Jellyfish

• hydra

• sea anemone

• coral

What are the stinging in predatory cnidarians called?

• Stingers

• Triggers

• Nematocysts

• Nerve Net

Corals get their color, oxygen, and glucose from organisms called ____.

• Bacteria

• Zooxanthellae

• Sponges

• Diatom

What is the hard structure that provides the foundation for the reef? Choose the best answer.

• Calcium Carbonate

• Calcium

• Carbonate

• Stone

What are atolls?

• Coral reefs in a shape of a ring that surround a sunken island

• Coral reefs that grow in the shape of a square

• Coral reefs that are not alive anymore