Annelids and Mollusks

Which animals are the FIRST to have developed a true coelom?

• Nematodes & Platyhelminthes
• Mollusks & Annelids
• Cnidarians & Ctenophores
• Nematodes & Mollusks

What do Mollusks have that secretes a shell of CaCO₃?

• Foot
• Head
• Mantle
• Mesoderm

What type of circulatory system do annelids have?

• Open Circulatory System
• Closed Circulatory System
• They don't need a circulatory system
• They have both types

Which annelid has developed the ability to suck blood from other organisms?

• Oligochaeta
  (earthworms)
• Polychaeta
  (bristle worms)
• Hirudinea
  (leeches)
• Nematoda
  (roundworms)

Which structure aids in eating for a mollusk?

• siphon
• radula
• visceral mass
• ganglia

Which phylum do earthworms belong to?

• Molluska
• Annelida
• Nematoda
• Platyhelminthes

Which of the following is NOT a class in phylum Mollusca?

• Gastropoda
• Bivalvia
• Cephalopoda
• Hirudinea

Which mollusk class would you see organisms moving using
"jet propulsion"?

• Gastropoda
• Cephalopoda
• Bivlavia
• Oligochaeta

Which class of mollusks is shown in the picture?

• Gastropoda
• Molluska
• Bivalia
• Polychaeta

How does a clam move?

• Using the radula
• Using the mantle
• Using the foot
• Using the gills