Name: ______________________
____ 1 Which of these statements is true of sponges?
A
B
C
D
Chapter 33 Review
They have no true tissues.
They are pseudocoelomates.
They have an open circulatory system.
Food is digested within a gastrovascular cavity.
____ 2 Which of these statements is true of cnidarians?
A
B
C
D
They are segmented.
They have a nerve net.
They have an exoskeleton composed of chitin.
They have three tissue layers (they are triploblastic).
____ 3 Of the phyla on the phylum chart, the simplest (most primitive) one to have three tissue layers is the
phylum
A
B
C
D
Cnidaria
Chordata
Arthropoda
Platyhelminthes
____ 4 Which of these statements is TRUE of nematodes?
A
B
C
D
They are segmented.
They lack a body cavity.
Their body plan has two main tissue layers.
They have a digestive system with two openings.
____ 5 Based on embryological evidence, echinoderms are most closely related to
A
B
C
D
rotifers.
annelids.
chordates.
arthropods.
____ 6 Earthworms are in the phylum
A
B
C
D
Annelida.
Nematoda.
Arthropoda.
Platyhelminthes.
____ 7 Which of these statements is TRUE of earthworms?
A
B
C
D
They have a body cavity.
They lack an excretory system.
They have a bony endoskeleton.
Their body plan consists of two tissue layers.
____8 Zebra snails are classified in the phylum
A
B
C
D
Cnidaria.
Mollusca.
Arthropoda.
Echinodermata.
____ 9 Which of these characteristics is common to both snails and earthworms?
A
B
C
D
segmentation
an exoskeleton
a closed circulatory system
an digestive system with two openings
____ 10 Grasshoppers exchange gases with the environment via
A
B
C
D
nephridia.
book lungs.
Malpighian tubules.
spiracles and tracheae.
____ 11 Crayfish are classified in the phylum
A
B
C
D
Annelida.
Nematoda.
Arthropoda.
Echinodermata.
____ 12 As adults, sea stars
A
B
C
D
are asymmetrical.
lack a digestive system.
exhibit radial symmetry.
exhibit bilateral symmetry.
____ 13 Which of these is a characteristic of sea stars?
A
B
C
D
a brain
tube feet
nephridia
a closed circulatory system
____ 14 Which of these characteristics is shared by both dogs and sea stars?
A
B
C
D
lungs
a brain
an endoskeleton
no excretory system
____ 15 Raccoons are classified in the phylum
A
B
C
D
Mollusca.
Cnidaria.
Chordata.
Echinodermata.