Chapter 23 - Animals 1: Major Invertebrate Groups

Question 1

True or false? Animal cells do not have walls.

Answer 1

True

Question 2

A coelom is a _________.

a. type of bristle
b. resting stage
c. sensory organ
d. lined body cavity

Answer 2

d. lined body cavity

Question 3

Cnidarians alone have ____________.

a. nematocysts
b. a mantle
c. a hydrostatic skeleton
d. a radula

Answer 3

a. nematocysts

Question 4

Flukes are most closely related to ____________.

a. tapeworms
b. roundworms
c. arthropods
d. echinoderms

Answer 4

a. tapeworms

Question 5

Which group has six legs and two antennae?

a. crustaceans
b. insects
c. spiders
d. horseshoe crabs

Answer 5

b. insects

Question 6

The __________ are mollusks with a hinged shell.

a. bivalves
b. barnacles
c. gastropods
d. cephalopods

Answer 6

a. bivalves

Question 7

A spider’s chelicerae _____________.

a. detect light
b. inject venom
c. produce silk
d. eliminate excess water

Answer 7

b. inject venom

Question 8

Which of these groups includes the most species?

a. protostomes
b. roundworms
c. arthropods
d. mollusks

Answer 8

a. protostomes

Question 9

The ________ include the only winged invertebrates.

a. cnidarians
b. echinoderms
c. annelids
d. placozoans

Answer 9

c. arthropods

Question 10

The _________ have a coelom and are radial as adults.

a. cnidarians
b. echinoderms
c. annelids
d. placozoans

Answer 10

b. echinoderms

Question 11

Annelids and cephalopods have a(n) ___________ circulatory system.

Answer 11

closed

Question 12

Match the organisms with their descriptions.

\_\_\_ choanoflagellates
\_\_\_ placozoan
\_\_\_ sponges
\_\_\_ cnidarians 
\_\_\_ flatworms
\_\_\_ roundworms
\_\_\_ annelids
\_\_\_ arthropods 
\_\_\_ mollusks
\_\_\_ echinoderms 

a. complete gut, paeudocoelom
b. protists closest to animals
c. simplest organ system
d. body with lots of pores
e. jointed exoskeleton
f. mantle over body mass
g. segmented worms
h. tube feet, spiny skin
i. nematocyst producer
j. simplest known animal

Answer 12

Match the organisms with their descriptions.

(b) choanoflagellates
(j) placozoan
(d) sponges
(i) cnidarians
(c) flatworms
(a) roundworms
(g) annelids
(e) arthropods
(f) mollusks
(h) echinoderms

a. complete gut, paeudocoelom
b. protists closest to animals
c. simplest organ system
d. body with lots of pores
e. jointed exoskeleton
f. mantle over body mass
g. segmented worms
h. tube feet, spiny skin
i. nematocyst producer
j. simplest known animal