chapter 33 part 2

The functions of the lophophore include which of the following? Release of gametes Obtaining food Gas exchange Locomotion

Obtaining food Gas exchange

The class Crustacea includes which of the following? Pill bugs Millipedes Shrimp Centipedes Moths Crabs

Pill bugs Shrimp Crabs

Among annelids, the class _____ is characterized by the presence of many parapodia.

Polychaeta

Which of the following are advantages of an exoskeleton? Protection against water loss Support for the body A high degree of flexibility Protection from predators

Protection against water loss Support for the body Protection from predators

Which of the following are advantages of an exoskeleton? A high degree of flexibility Protection from predators Support for the body Protection against water loss

Protection from predators Support for the body Protection against water loss

What is a major disadvantage of an exoskeleton?

Restricted mobility

Segmented organisms with jointed legs and a hard exoskeleton composed of chitin belong to the phylum

anthropods

Examples of the Mollusca phylum include brachiopods clams snails tunicates

clams snails

Annelids have a ____ circulatory system

closed

In an annelid, the digestive tract is suspended within the spacious __________which is surrounded by the body wall.

coelom

The muscular foot of a mollusk may be adapted for locomotion. food capture. elimination of wastes digging. attachment.

locomotion. food capture. digging. attachment.

The thick epidermal sheet that covers the dorsal side of a mollusk's body is the

mantle

In a mollusk, the ___ secretes the shell, while the muscular ___ is used for locomotion.

mantle, foot

A hard exoskeleton provides protection against predators; however, it also restricts an animal's

mobility

Squid, octopuses, chitons, snails, clams, and oysters are all members of the phylum

mollusks

Functions of the arthropod exoskeleton include

muscle attachment, water conservation, and protection.

The class __________ is comprised of centipedes and millipedes.

myriapoda

Unsegmented worms that are round in cross section, have longitudinal muscles, and are covered by a flexible, thick cuticle that is molted as they grow, belong to the phylum

nematode

Annelid segments are divided from one another internally by

septa

_____________ involves twisting of the gastropod body so the mantle cavity and anus are moved from a posterior location to the front of the body.

torsion

Identify the phylum whose members have the following characteristics: Marine lophophorate organisms with two calcified valves (dorsal and ventral) that resemble shells.

Brachiopoda

Which of the following does a mollusk use for movement?

Foot

The lophophore, the structure characteristic of lophophorates, plays important roles in which of the following processes? Feeding Reproduction Protection Movement Respiration

Feeding Respiration

Members of the class Polyplacophora are

chitons

Polyplacophorans are commonly known as

chitons

Which environments are inhabited by mollusks?

Marine, freshwater, and terrestrial

Which of the following accurately describes chelicerates? Most are carnivorous Bodies consist of three tagmata The most anterior appendages are mandibles Predominantly aquatic Have four pairs of walking legs

Most are carnivorous Have four pairs of walking legs

What are characteristics of the class Chelicerata? Locomotion is achieved by 8 pairs of legs. Mouthparts can be modified as pincers or fangs. Bodies consist of two tagmata. Predominantly aquatic

Mouthparts can be modified as pincers or fangs. Bodies consist of two tagmata.

Ribbon worms are found in which of the following phyla?

Nemertea

Ribbon worms are members of the phylum

Nemertea

Which of the following accurately describes the characteristics of nematodes? They are only found in marine habitats. They are covered by a flexible, thick cuticle that molts as they grow. They are bilaterally symmetrical. Their body is composed of a series of ringlike segments which are separated internally by partitions called septa. Muscles extend longitudinally beneath epidermis.

-They are covered by a flexible, thick cuticle that molts as they grow. -They are bilaterally symmetrical. -Muscles extend longitudinally beneath epidermis.

What type of circulatory system do annelids have?

A closed circulatory system

Each segment of an annelid contains which of the following? A ganglion Gills A heart Locomotory structures Excretory organs

A ganglion Locomotory structures Excretory organs

The annelid body plan can be described as which of the following?

A tube within a tube.

What is the mantle of a mollusk?

An epidermal sheet covering the dorsal side of the body

All members of the phylum Arthropoda have which of the following characteristics? An exoskeleton composed of chitin and protein Segmentation Eight legs and chelicerae Jointed legs A closed circulatory system

An exoskeleton composed of chitin and protein Segmentation Jointed legs

Which characteristics are typical of bryozoans? Lophophore located between two shells Large, swimming individuals Anus opens near the mouth, due to its U-shaped digestive system Small, colonial animals

Anus opens near the mouth, due to its U-shaped digestive system Small, colonial animals

Many arthropods possess tagmata. What are they?

Body segments that have become fused into functional units

Gills in aquatic mollusks are also called which of the following?

Ctenidia

Insects and some other animals, such as the soil-dwelling Collembola belong to the class

Hexapoda

Which of the following is a major advantage of segmentation?

Individual segments can become specialized for different functions.

The class Hexapoda includes which of the following? Insects Mites and ticks Centipedes and millipedes Lobsters and crayfish

Insects

Describe the mollusk coelom. It is in spaces around the excretory organs, the heart, and part of the intestine. It is absent. It is highly reduced. It is extensive. It is secreted by the mantle. It is concentrated in a visceral mass.

It is in spaces around the excretory organs, the heart, and part of the intestine. It is highly reduced.

What characteristics are typical of bryozoans? Live in colonies Ciliated lophophore U-shaped digestive system Two calcified valves

Live in colonies Ciliated lophophore U-shaped digestive system

Which of the following characteristics are typical of brachiopods? Two lateral calcified shells Lophophore between the shells Colonial Zoecium attached to rocks or other substrates Two calcified valves: dorsal and ventral

Lophophore between the shells Two calcified valves: dorsal and ventral

What feature of a body plan allows the specialization of different parts of the body for different function?

Segmentation

What secretes the calcium carbonate of the shell in a mollusk?

The mantle

The gills of aquatic mollusks are also called

ctenidia

In arthropods, the hard ___ provides protection and physical support, the jointed ___ provide flexibility, and the ___ body plan allows specialization of different body parts.

exoskeleton,appendages,segmented

Mollusks use a muscular ___ (also known as podium) for movement.

foot

The muscular______ of a mollusk may be adapted for locomotion, attachment, food capture, or digging.

foot

The basic body plan of a mollusk consists of three parts: a muscular ________(used for movement), a __________mass (which contains the internal organs), and a _________(which produces the shell in mollusks that have one).

foot, visceral,mantle

The most abundant herbivores are

insects

Which organisms are members of the class Crustacea? pill bugs spiders shrimp lobsters

pill bugs shrimp lobsters

One of the advantages of an exoskeleton is that it provides minimal weight relative to body size. increased flexibility. support for the body.

support for the body.

In many arthropods, the body segments have become fused into functional units called

tagmata

Arthropods play a role in the pollination of crops the destruction of crops the spreading of serious diseases synthesizing essential organic molecules from inorganic sources

the pollination of crops the destruction of crops the spreading of serious diseases

Gastropods are unique among animals in that they undergo ______during larval life.

torsion

Terrestrial habitats of mollusks must have at least a temporary supply of

water