Chapter 25:
What Is an Animal?
Practice Test
1.
The layer of cells on the outer surface of the gastrula is called the __________.
a.
endoderm
b.
dermis
c.
ectoderm
d.
mesoderm
Hint
2.
The cell layer that forms during development and eventually becomes the lining of the animal`s digestive tract is the __________.
a.
dermis
b.
ectoderm
c.
mesoderm
d.
endoderm
Hint
3.
The cell layer that forms during development and eventually becomes the skin and nervous tissues of the animal is the __________.
a.
dermis
b.
ectoderm
c.
endoderm
d.
mesoderm
Hint
4.
In acoelomate animals, such as flatworms, organs are located ________.
a.
in solid body tissues
b.
in the coelom
c.
in the pseudocoelom
d.
in the fluid-filled body cavity lined with mesoderm
Hint
5.
The development of body cavities made it possible for animals to __________.
a.
respond to stimuli
b.
get oxygen more effectively
c.
stay small
d.
grow larger and move more efficiently
Hint
6.
A skeleton inside the body of an animal is called a(n) __________.
a.
endoskeleton
b.
exoskeleton
c.
vertebrate
d.
mesoskeleton
Hint
7.
The evolution of the coelom made it possible for animals to __________.
a.
become land animals
b.
have space for complex internal organs
c.
become more adapted to their way of life
d.
become larger and thicker in body shape
Hint
8.
A type of skeleton that can help to prevent water loss and provide protection is called a(n) ___________.
a.
vertebrate
b.
exoskeleton
c.
endoskeleton
d.
mesoskeleton
Hint
9.
The heart and blood vessels in a dog develop from the __________.
a.
ectoderm
b.
protostome
c.
mesoderm
d.
endoderm
Hint
10.
An organism that can be divided vertically into similar right and left halves that form mirror images of one another is said to have __________.
a.
total symmetry
b.
bilateral symmetry
c.
asymmetry
d.
radial symmetry
Hint
11.
Structures that act as a kind of watery skeleton against which muscles can work are called the _________.
a.
acoelom and pseudocoelom
b.
coelom and pseudocoelom
c.
acoelom and coelom
d.
coelom and mesoderm
Hint
12.
During development, the cells on the side of the blastula fold inward to produce a __________.
a.
zygote
b.
gastrula
c.
mesoderm
d.
fertilized egg
Hint
13.
The evolution of the pseudocoelom made it possible for animals to __________.
a.
become more adapted to their way of life
b.
have space for complex internal organs
c.
move more efficiently
d.
become land animals
Hint
14.
Animals such as earthworms digest food in a ________.
a.
gizzard
b.
pseudocoelom
c.
gastrula
d.
digestive tract
Hint
15.
A body cavity completely surrounded by mesoderm is called a __________.
a.
coelom
b.
blastula
c.
gastrula
d.
protosome
Hint
