Porifera, Cnidaria, Platyhelminthes

The hard "skeleton" structures in a sponge are called...

• Spongin
• Spicules
• Amebocytes
• Pinococytes

What kind of symmetry does a Cnidarian have?  

• No Symmetry 
• Bilateral Symmetry 
• Radial Symmetry 
• Square

What phylum has two different forms that exist which are called the medusa and the polyp?

• Phylum Porifera
• Phylum Cnidaria
• Phylum Platyhelminthes
• Kingdom Animalia

Which of the following is a correct description of the Cnidarian digestive tract?

• A complete digestive tract consisting of two openings.
• A complete digestive tract consisting of one opening
• An incomplete digestive tract consisting of two openings.
• contains only a mouth and an internal cavity.

Which part of the sponge body is a large opening at the top of the central cavity through which water leaves the sponge?

• Ostia
• Meenchyme
• Spongecoel
• Osculum

What phylum of invertebrates does the following picture belong?

• Platyhelminthes
• Cnidaria
• Porifera
• Mollusca

What phylum of invertebrates does the following picture belong?

• Cnidaria
• Porifera
• Platyhelminthes
• Animalia

Tentacles contain cnidocytes that hold/secrete coiled thread with an attached barb called a ...

• nematocyst

• spicule

• ectoderm

• spirocyst

The image represents a nematocysts which Cnidarians use to subdue their prey. What is the name of the specialized cell that secretes the nematocyst?

• cnidocyte

• barb capsule

• gastroblast

• nematocyst

What phylum does this animal belong in the image?

• Platyhelminthes
• Cnidaria
• Porifera
• Plantae