Invertebrates

Which of the following is NOT a defining characteristic of animals?

• Prokaryotic

• Lack a cell wall

• Multicellular

• Heterotroph

Plants are not considered animals because

• they aren't multicellular

• they aren't heterotrophs

• they aren't eukaryotic

• they have cell walls

Bacteria are not considered animals because

• they aren't multicellular

• they aren't eukaryotic

• they have cell walls

• they don't reproduce

Cnidarians have ________________ symmetry, meaning ...

• Radial; mirror left and right halves

• Radial; equal around a central point

• Bilateral; mirror left and right halves

• Bilateral; equal around a central point

The __________ form of cnidarians look like tubes with tentacles and tend to be sessile.

• medusa

• jelly

• polyp

• sponge

The _______ form of cnidarians looks like an umbrella with tentacles hanging down and tend to be slow-moving.

• medusa

• anemone

• polyp

• sponge

Which phylum includes flatworms, planarians and liver flukes?

• Platyhelminthes
• Nematoda
• Annelida

Which of the following do all worms have in common?

• They are all coelomates.
• They are all bilateral
• They all have a complete digestive tract.
• They are all parasitic.

Which phylum contains segmented worms like earthworms and leeches?

• Platyhelminthes
• Nematoda
• Annelida

Which of the following is a correct description of a hermaphrodite?

• An organism that has both a mouth and an anus.
• An organism that has a centralized nervous system
• An organism that produces both sperm and eggs
• An organism that has all three germ layers.