Nematoda and Rotifera

Pseudocoelomates have a hollow, fluid-filled cavity that is

• lined by the ectoderm on the outside and mesoderm on the inside.

• lined by the mesoderm on the outside and endoderm on the inside.

• completely surrounded by the mesoderm.

• completely surrounded by the endoderm.

The round worm digestive tract

• has no opening

• has a single opening

• has two openings

• is absent in parasitic round worms

Ascaris eggs enter the body of a human host when the

• host ingests contaminated food or water

• eggs attach to the bare sole of a human foot

• eggs are inhaled as spores

• cysts rupture inside uncooked meat

Hookworms normally reach the human intestine after they

• are ingested as cysts in contaminated meat

• bore directly from the skin of the abdomen to the intestine

• enter the host's digestive tract and migrate to the intestine

• travel through the blood to the lungs and throat and are then swallowed.

A rotifer's excretory system includes

• flame cells and excretory tubules

• contractile vacuoles

• a single, small kidney

• many excretory pores on the body surface

Caused by a filarial worm

• elephantiasis

• trichinosis

• hookworm

• mastax

Associated with cysts

• elephantiasis

• trichinosis

• hookworm

• mastax

always parasitic

• elephantiasis

• trichinosis

• hookworm

• mastax

Breaks food into pieces

• elephantiasis

• trichinosis

• hookworm

• mastax

Collects excess water

• Cloaca

• Rotifer

• Gastrovascular cavity

• Flame Cell