Life Science: Animal Diversity, Book C

Chapter 2: Mollusks, Worms, Arthropods, Echinoderms

Mollusks, Worms, Arthropods, and Echinoderms

1.
Scientists hypothesize that __________ are the invertebrate group that most closely resembles animals with backbones.
A)echinoderms
B)segmented worms
C)mollusks
D)arthropods
2.
Why would agriculture be impossible without arthropods?
A)Insect pests feed on cultivated crops.
B)They help return nitrogen to the soil.
C)They aerate the soil.
D)Insects pollinate crops.
3.
What annelid worm has a sucker at each end of its body?
A)a polychaete
B)a leech
C)an earthworm
D)a bristleworm
4.
A(n) __________ is an example of an organism from the most specialized and complex mollusk group.
A)squid
B)slug
C)oyster
D)clam
5.
What are the stages of development in complete metamorphosis?
A)egg, worm, adult
B)egg, birth, larva, insect
C)egg, nymph, and adult
D)egg, larvae, pupa, and adult
6.
One reason segmented worms are important to humans is because some of them __________.
A)drill holes in submerged wood
B)condition and aerate the soil
C)pollinate crops
D)destroy mollusks
7.
What does the word annelid mean?
A)head-footed
B)little rings
C)spiny skin
D)jointed foot
8.
Which one of the following is a thin layer of tissue in mollusks that often secretes a shell?
A)gizzard
B)mantle
C)radula
D)exoskeleton
9.
While on a picnic, you avoid an insect with yellow and black stripes. Later, you discover the insect was a harmless fly. What self-defense does this fly use?
A)foul odor
B)poisonous sting
C)mimicry
D)camouflage
10.
Crabs and water fleas are examples of __________.
A)arachnids
B)crustaceans
C)centipedes
D)insects
11.
Swimmerets help some crustaceans, like crabs, take in dissolved oxygen by forcing the water over __________.
A)book lungs
B)feathery gills
C)spiracles
D)moist skin
12.
Which one of the following special structures does an earthworm use to grind up soil it ingests?
A)intestine
B)gizzard
C)setae
D)crop
13.
Which group of mollusks often has eyes on the tips of tentacles and uses a radula to obtain food?
A)gastropods
B)arachnids
C)bivalves
D)cephalopods
14.
How are arthropods like annelids?
A)Both have setae.
B)Both have segmented bodies.
C)Both have an exoskeleton.
D)Both have jointed appendages.
15.
Which one of the following is a characteristic of insects that can be used to distinguish them from other arthropods?
A)They have long bodies with many segments.
B)They have an exoskeleton.
C)They have eight legs.
D)They can fly.
16.
What special feature does a cephalopod use to move quickly?
A)creeping on tentacles
B)a jet of water
C)a muscular foot
D)rapid movement of its shell
17.
At the ocean, you find an organism that is covered with stiff, hairlike spines. Which one of the following is it likely to be?
A)sea cucumber
B)brittle star
C)sand dollar
D)sea urchin
18.
Which of the following groups would you expect to have the best-preserved fossils?
A)slugs
B)leeches
C)earthworms
D)insects
19.
Which one of the following is an example of an arachnid?
A)bee
B)grasshopper
C)crab
D)scorpion
20.
Sea stars move by using their __________.
A)muscular foot
B)tube feet
C)jointed appendages
D)tentacles
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