Unit 6: Annelids

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 phylum do earthworms belong to?

• Molluska
• Annelida
• Nematoda
• Platyhelminthes

Annelids are considered:

• Monoblastic with only one germ layer
• Diploblastic with two germ layers
• Triploblastic with three germ layers
• Quadroblastic with four germ layers

Most annelids have what type of symmetry?

• Bilateral symmetry
• Radial symmetry
• No symmetry (asymmetrical)

Annelids are considered:

• Acoelomate deuterostomes
• Acoelomate protostomes
• Coelomate deuterostomes
• Coelomate protostomes

Which class of worms contain few setae and no parapodia?

• Oligochaeta
• Hirudinida
• Polychaeta

Which class of worms lack setae and parapodia but instead have suckers?

• Oligochaeta
• Hirudinida
• Polychaeta

The largest, most diverse, and most primitive class of Annelids is:

• Oligochaeta
• Hirudinida
• Polychaeta

The movement of annelids is primarily caused by contractions and relaxations of these types of muscles:

• transverse, sagital
• longitudinal, striated
• circular, striated
• longitudinal, circular