Name: 
 

CH. 11 Mollusks, Arthropods, and Echinoderms


Modified True/False
Indicate whether the sentence or statement is true or false.  If false, change the identified word or phrase to make the sentence or statement true.
 

1. 
Mollusks are vertebrates with soft bodies that are often covered by a shell. _________________________

 

2. 
A gastropod has two shells held together by hinges and strong muscles. _________________________

 

3. 
An arthropod's body is supported and protected by an exoskeleton. _________________________

 

4. 
Arachnids have six legs but no antennae. _________________________

 

5. 
Insects have three body parts and six legs. _________________________

 

6. 
Most insects are harmless to humans. _________________________

 

7. 
An insect that looks like a small adult when it hatches goes through gradual metamorphosis. _________________________

 

8. 
A small amount of pheromone is needed to communicate with other animals. _________________________

 

9. 
The production of light by a living organism is called illumination. _________________________

 

10. 
Echinoderms have five-part bilateral symmetry. _________________________

 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

11. 
Which of the following is true of all mollusks?
a.
They have shells.
b.
They have soft bodies.
c.
They have segments.
d.
They have gills.
 

12. 
Which of the following is a function of a mollusk's mantle?
a.
It produces the shell.
b.
It enables the mollusk to move.
c.
It helps the mollusk digest food.
d.
It removes wastes.
 

13. 
A mollusk's radula enables it to
a.
reproduce.
b.
remove oxygen from water.
c.
remove wastes from the body.
d.
scrape food from a surface.
 

14. 
Much evidence that mollusks have been on Earth for millions of years comes from
a.
fossil radulae in ancient riverbeds.
b.
ancient wampum beads.
c.
fossil shells in limestone rocks.
d.
fossil tracks in sand.
 

15. 
Snails and slugs belong to which group of mollusks?
a.
gastropods
b.
arthropods
c.
bivalves
d.
cephalopods
 

16. 
A bivalve obtains food by
a.
using a radula.
b.
filtering it from water.
c.
trapping it between two shells.
d.
grabbing it with its muscular foot.
 

17. 
Cephalopods move by
a.
using jet propulsion.
b.
moving their tentacles.
c.
crawling along on a muscular foot.
d.
clapping their shells together.
 

18. 
Which characteristic is NOT common to all arthropods?
a.
a segmented body
b.
an external skeleton
c.
jointed appendages
d.
a backbone
 

19. 
An arthropod's tough outer covering is called
a.
an endoskeleton.
b.
an exoskeleton.
c.
armor.
d.
a mantle.
 

20. 
Which arthropods have no antennae?
a.
crustaceans
b.
arachnids
c.
insects
d.
ticks
 

21. 
Where do most crustaceans live?
a.
in water
b.
on mountains
c.
in the desert
d.
underground
 

22. 
Which of the following is a characteristic of millipedes?
a.
They feed on other arthropods.
b.
They have tiny stingers to stun their prey.
c.
They have two pairs of legs on each segment.
d.
They inject venom into their prey.
 

23. 
The bodies of all spiders have
a.
two body sections.
b.
two antennae.
c.
two wings.
d.
six swimmerets.
 

24. 
Which of these is NOT an arthropod?
a.
centipede
b.
grasshopper
c.
snail
d.
lobster
 

25. 
Which of the following is a characteristic shared by all insects?
a.
one pair of antennae
b.
four legs
c.
three pairs of wings
d.
two body sections
 

26. 
Which of these is NOT an insect?
a.
bee
b.
beetle
c.
mite
d.
grasshopper
 

27. 
How does a grasshopper get oxygen?
a.
through gills
b.
through a system of tubes
c.
through its skin
d.
by breathing through its mouth
 

28. 
Camouflage benefits insects by helping them to
a.
obtain food.
b.
move especially fast.
c.
live in a variety of environments.
d.
avoid predators.
 

29. 
How do some insects help farmers?
a.
by carrying pollen from one plant to another
b.
by spinning fibers made of silk
c.
by serving as food for farm animals
d.
by fertilizing soil
 

30. 
Which of the following is NOT an echinoderm?
a.
a sea cucumber
b.
a sea urchin
c.
a millipede
d.
a brittle star
 

31. 
Which of these is an advantage of using biological controls against harmful insects?
a.
They kill only one or a few insect pests.
b.
They cost less than chemical pesticides.
c.
They kill all the insects that threaten a farmer's crop.
d.
They prevent all insect larvae from becoming adult insects.
 

32. 
Which of these is NOT a stage in complete metamorphosis?
a.
egg
b.
larva
c.
pupa
d.
nymph
 

33. 
When a sea star eats a clam, where does digestion begin?
a.
in the spines
b.
in the water vascular system
c.
outside the sea star's body
d.
in one of the arms
 

34. 
Molting occurs during the gradual metamorphosis of an insect whenever
a.
the nymph needs food.
b.
it emerges from a cocoon.
c.
its full-sized wings harden.
d.
the nymph outgrows its exoskeleton.
 

35. 
Pheromones are chemical compounds that
a.
are released only by insects.
b.
produce light when they are released.
c.
have a very simple chemical structure.
d.
have a highly specific chemical structure.
 

36. 
Pheromones from one species of moth usually attract
a.
all flying insects.
b.
all types of moths.
c.
only moths and butterflies.
d.
only moths of the same species.
 

37. 
The light produced in bioluminescence is generated by
a.
chemical reactions.
b.
heat.
c.
pheromones.
d.
insects exposed to X-rays.
 

38. 
Fireflies use light to
a.
find water.
b.
keep themselves warm.
c.
reproduce.
d.
frighten predators.
 

39. 
Which of the following is an echinoderm characteristic?
a.
an exoskeleton
b.
three body sections
c.
five-part radial symmetry
d.
a segmented body
 

40. 
How does an echinoderm use its water vascular system?
a.
to defend itself from predators
b.
to regenerate broken limbs
c.
to sense when food is near
d.
to capture food and move
 

Completion
Complete each sentence or statement.
 

41. 
A thin layer of tissue called a(n) ____________________ covers the internal organs of mollusks.
 

 

42. 
Many mollusks feed with a(n) ____________________, which scrapes food from a surface.
 

 

43. 
Mollusks that lack tentacles and have a single shell or no shell at all are called ____________________.
 

 

44. 
The group of mollusks that has the most complex nervous system is ____________________.
 

 

45. 
Arthropod skeletons are made of a material called ____________________.
 

 

46. 
Many arthropods have appendages called ____________________ that help them sense their environment.
 

 

47. 
Spiders, mites, and ticks belong to the group of arthropods known as ____________________.
 

 

48. 
The kind of arthropod known as a(n) ____________________ has many segments with two legs on each segment.
 

 

49. 
An insect's wings and legs are attached to the section of its body called the ____________________.
 

 

50. 
Insects usually have two large ____________________ eyes, which contain many lenses.
 

 

51. 
Some insects can spread microorganisms that cause ____________________, such as malaria.
 

 

52. 
An example of ____________________ control is introducing ladybug beetles to fields where aphids are eating crops.
 

 

53. 
During complete metamorphosis, an insect becomes a(n) ____________________ when it is enclosed in a protective covering.
 

 

54. 
Butterflies and ants develop from egg to adult in the type of metamorphosis known as ____________________ metamorphosis.
 

 

55. 
Some animals release a ____________________, or chemical signal, that enables them to distinguish members of their own group from members of other groups.
 

 

56. 
Protective coloration, or ____________________, helps an insect blend in with its surroundings.
 

 

57. 
Fireflies use light to attract ____________________.
 

 

58. 
Arthropods have a ____________________ body, which means that the body is divided into many linked sections.
 

 

59. 
Some kinds of the rock called ____________________ are made partly from the shells of ancient mollusks.
 

 

60. 
Cephalopods move by jet propulsion when they squeeze ____________________ out of their mantle cavities.
 

 



 
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