Exam 33: Protostomes

In arthropods,locomotion is accomplished by muscles that work against

If a hiker picked up a mollusk on a trail in a rain forest,what class would it belong to?

In mollusks,the folds of tissue that arise from the dorsal body wall and enclose a cavity surrounding the visceral mass are called the

Squids and octopuses move by means of water movement through their

The lophophore of a brachiopod serves the same function as the ________ in a bivalve.

Brachiopods develop as protostomes,but they show ________ cleavage.

Barnacles are sessile filter feeders but unlike bivalves they have internal fertilization.How do they solve this problem?

The nitrogenous waste in mollusks is removed by

Turbellarian flatworms have a distinct head.When compared to the head of an insect,what is the flatworm head missing?

Examples of mollusks that live on land are the

The partitions that separate the segments of the annelid body are known as

Each segment of an annelid typically contains bristles of chitin called

Decapod crustaceans (shrimps,lobsters,and crabs)all lack

In many arthropods,body segments have become fused into functional groups called ________.

Spiders and certain other arthropods which lack jaws or mandibles are placed in a subphylum called

You and your biology lab class take a field trip to a marine aquarium.Your guide is a marine biologist who studies squids.She explains to your class how squids are able to blend into their environment.She points out that squids have pouches of pigments embedded in their epithelium.The pouches are called

Radula modification allowed all of the following functions in gastropods except

Inside its beak an octopus has a rasping tongue that is used to tear apart food.Which gastropod structure is this analogous to?

A snail in your garden and an oyster are quite different in appearance.What would be evidence to justify grouping them together?

The organ that is responsible for secreting cocoons in the oligochaetes is known as the