Worms: Platyhelminthes, Nematoda, and Annelida

Which phylum of worms is the simplest and slightly more complex than cnidarians?

• Platyhelminthes

• Nematoda

• Annelida

• Cnidaria

What is the intermediate body layer in flatworms that forms muscle tissue?

• Endoderm

• Ectoderm

• Mesoderm

• Coelom

What type of symmetry do worms exhibit?

• Asymmetry

• Spherical symmetry

• Radial symmetry

• Bilateral symmetry

What is the function of the flame bulb in flatworms?

• Digest food

• Remove waste products and excess water

• Transport nutrients

• Sense light

Which phylum of worms includes segmented worms?

• Cnidaria

• Annelida

• Nematoda

• Platyhelminthes

What is the name of the tubular mouthpart used by flatworms to feed?

• Auricle

• Pharynx

• Ganglion

• Flame bulb

What is the primary function of the coelom in worms?

• To provide a body cavity between the digestive tube and external body wall

• To transport nutrients and oxygen

• To sense light

• To eliminate waste products

Which sensory structure in free-living flatworms detects light?

• Flame bulb

• Auricles

• Eyespots

• Ganglion

What is the term for the series of tubes in worms that transport dissolved nutrients, oxygen, and waste products?

• Nervous system

• Circulatory system

• Excretory system

• Digestive system

What is the name of the nerve cell mass in flatworms that acts as a primitive brain?

• Auricle

• Ganglion

• Flame bulb

• Pharynx