Porifera and Cnidarians

What is an invertebrate?

• An animal with a backbone
• a mammal
• An animal without a backbone
• birds

I have a digestive cavity with one opening, and have tentacles.  I am a hydra.

• Echinoderm
• Cnidarian
• Arthropod
• Mollusk

Which phylum is mainly asymmetrical?

• cnidaria
• porifera (sponges)
• echinodermata
• arthropoda

These organisms all have nematocysts.

• cnidaria
• mollusca
• arthropoda
• porifera

This form of cnidaria is known as a _______.

• polyp
• medusa

This form of cnidaria is known as a __________.

• medusa
• polyp

What filters food and eliminates waste from the water it lives in?

• sponge
• segmented worm
• arthropod
• mollusk

Sponges use pores to 

• move from place to place.
• filter food from the water.
• defend themselves.

Cnidarians have what kind of symmetry?

• Radial
• Bilateral
• Asymmetrical

Nematocysts (stinging cells) are used for...

• Defense

• Catch organisms for food

• Both feeding and defense