Platyhelminthes, Nematodes & Annelids

Which of these classes of worms was the first group of animals to develop a closed circulatory system, a huge step forward in evolution?

• Platyhelminthes

• Nematoda

• Annelida

• Gastropoda

To which phylum do roundworms belong?

• Molluska
• Annelida
• Nematoda
• Platyhelminthes

To which phylum do earthworms belong?

• Molluska
• Annelida
• Nematoda
• Platyhelminthes

______ are also called flatworms. They are bilaterally symmetrical worms that include planaria, flukes and tapeworms. 

• Cnidarians
• Platyhelminthes
• Nematodes
• Mollusks

Earthworms and leeches are common examples of? 

• Nematodes
• Annelids
• Mollusks

Most of the worms we have studied are hermaphrodites. Define this term.

• They have three tissue layers.

• They have a body cavity.

• They produce both eggs and sperm.

• They can regenerate lost body parts.

What type of symmetry do Platyhelminthes bodies have?

• bilateral

• radial

• asymmetrical

• both asymmetrical and radial

Platyhelminthes worms are

• acoelomates
• pseudocoelomates
• eucoelomates

All of the following body systems can be found in a segmented worm EXCEPT the _______ system.

• Circulatory
• Digestive
• Reproductive
• Skeletal

Tags

NGSS.MS-LS4-2

The majority of flatworms are parasitic.

• True
• False