Biology

Robert J. Brooker

Chapter 34

The Invertebrates - all with Video Answers

Educators

KM

Chapter Questions

Problem 1

Choanocytes are
a. a group of protists that are believed to have given rise to animals.
b. specialized cells of sponges that function to trap and eat small
particles.
c. cells that make up the gelatinous layer in sponges.
d. cells of sponges that function to transfer nutrients to other cells.
e. cells that form spicules in sponges.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 2

Why aren't sponges eaten more often by predators?
a. They are protected by silica spicules.
b. They are protected by toxic defensive chemicals.
c. They are often eaten; it's just that the leftover cells reaggregate into new, smaller sponges.
d. Both a and b are correct.
e. All three explanations, a, b, and c, are correct.

KM

Katerine Mendez

Numerade Educator

Problem 3

Which of the following organisms can produce female offspring through parthenogenesis?
a. cnidarians
b. flukes
c. choanocytes
e. annelids
d. rotifers

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 4

What organisms survive without a mouth, digestive system, or anus?
a. cnidarians
b. rotifers
c. echinoderms
d. cestodes
e. nematodes

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 5

Which phylum does not have at least some members with a closed circulatory system?
a. Lophophorata
b. Arthopoda
c. Annelida
d. Mollusca
e. All of the above phyla have some members with a closed circulatory
system.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 6

A defining feature of the Ecdysozoa is a
a. segmented body.
b. closed circulatory system.
c. cuticle.
d. complete gut.
e. lophophore.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 7

In arthropods, the tracheal system is
a. a unique set of structures that function in ingestion and digestion of food.
b. a series of branching tubes extending into the body that allow for gas exchange.
c. a series of tubules that allow waste products in the blood to be released into the digestive tract.
d. the series of ommatidia that form the compound eye.
e. none of the above.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 8

Characteristics of the class Arachnida include
a. two tagmata.
b. six walking legs.
c. an aquatic lifestyle.
d. a lobed body.
e. both b and d.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 9

Incomplete metamorphosis
a. is characterized by distinct larval and adult stages that do not compete for resources.
b. is typically seen in arachnids.
c. involves gradual changes in life stages in which the young resemble the adult stage.
d. is characteristic of the majority of insects.
e. always includes a pupal stage.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 10

Which clade includes echinoderms?
a. Protostomia
b. Bilateria
c. Ecdysozoa
d. Lophotrochozoa
e. Echinoderms are a member of all the above clades.

Christina Sorrentino

Christina Sorrentino

Numerade Educator