ch.8

If you discovered a new organism with 10 jointed legs, you would expect it to have

muscles attached to an exoskeleton.

A _________ is a digestive tube with a separate mouth and anus that lies within a fluid-filled pseudocoelom.

Alimentary canal

If you wanted to show an example of segmentation to a group of visiting students, which phylum would be the best choice?

Arthropoda

A confused friend from your course has made a Halloween costume that is supposed to show one animal phylum. It has a hard outer shell and a water vascular system. You point out that the costume combines features of

Arthropoda and Echinodermata.

This group of mollusc is found in aquatic environments, and is characterized by a hinged shell.

Bivalves

Which of the following animal phyla is not an invertebrate?

Chordata

The tentacles of cnidarians are armed with these unique cells that function in defense and capture of prey.

Cnidocytes

This process is characterized by a larval stage that look entirely different from the adult stage after undergoing pupation.

Complete metamorphosis

This group of invertebrate is characterized by being covered in a tough coat called a cuticle, which undergoes a process of molting.

Ecdysozoans

Which phylum has a water vascular system?

Echinodermata

Sponges are this type of feeder that captures food particles suspended in the water.

Filter feeder

This structure found in phylum Mollusca is responsible for secreting the shell.

Mantle

Your friend, who was setting up a lab on arthropods for your class, put out specimens of the following groups. Which needs to be removed?

Ophiuroids

This phylum is the best example of an an animal group with enhanced overall surface area.

Platyhelminthes

The major difference between the two divisions of annelids, the errantians and sedentarians, is that

sedentarians are less mobile than errantians.

Which of the following groups is the parasitic group belonging to Rhabditophora.

tremodata

These flagellated cells function to pull water into the body of the sponge, and can differentiate into sperm during sexual reproduction.

Choanocytes

Which of the following statements about arthropods is false?

Most arthropod sensory organs are concentrated at the posterior end.

The flatworm excretory apparatus consists of these structures, which are networks of ciliated tubules that pull fluid through ducts opening to the outside environment.

Protonephridia

There are two variations on the cnidarian body plan, the sessile __________ and motile __________.

polyp, medusa