Zoology Quiz

Members of which worm phylum were the first to exhibit triploblastic development with a mesoderm layer?

• Platyhelminthes

• Nematoda

• Annelida

• Cnidaria

Tags

NGSS.MS-LS4-2

Flatworms lack a coelom, instead possessing what type of body organization?

• Pseudocoelomate

• Acoelomate

• Eucoelomate

• Coelomate

What unique excretory structures, composed of interconnected protonephridia, are found in flatworms?

• Nephridia

• Malpighian tubules

• Flame cells

• Book lungs

The parasitic tapeworm attaches to its host using what specialized head region?

• Scolex

• Proglottid

• Flame cell cluster

• Ganglion

In Class Trematoda, the life cycle alternates between:

• Asexual phase in a vertebrate, sexual in an invertebrate

• Sexual phase in a vertebrate, asexual in an invertebrate

• Sexual phase in both vertebrates and invertebrates

• Asexual phase only in freshwater snails

Tags

NGSS.MS-LS3-2

Roundworms differ from flatworms in having:

• Segmented bodies

• A true coelom

• A complete digestive tract with mouth and anus

• Jointed appendages

Roundworms are classified as pseudocoelomates because their gut cavity:

• Is completely surrounded by mesoderm

• Floats in fluid without independent muscular layers

• Possesses circular and longitudinal muscles

• Functions only for respiration

Annelids exhibit metamerism, meaning:

• Segmentation of body parts in repeating units

• Absorption of nutrients through skin

• Alternation of sexual and asexual generations

• Presence of a scolex and proglottids

The primitive brain of annelids is best described as:

• A dorsal nerve cord

• A cluster of neurons called a ganglion

• A pair of photosensitive eyespots

• A series of protonephridia

What unique adaptation of annelids represents a major evolutionary advancement over nematodes?

• Cephalization

• Presence of a true coelom

• Photosensitive eye spots

• Flame cells

Tags

NGSS.MS-LS4-2