Introduction to Animals

 

Name: 

Introduction to Animals


 

True/False
Indicate whether the sentence or statement is true or false.
 

1. 

A tissue is a group of dissimilar cells that are organized into a functional unit.
 

2. 

The development of a particular animal’s body plan depends on the animal’s environment, rather than on the genetic information it carries.
 

3. 

Flatworms are bilaterally symmetrical and cephalized.
 

4. 

The fluid in the body cavity of an animal acts as a medium of transport for nutrients and wastes.
 

5. 

All chordates retain their postanal tail in their adult life.
 

6. 

Most invertebrates have kidneys that filter waste products from the blood.
 

7. 

Terrestrial animals have a protective outer covering that helps prevent excessive water loss.
 

8. 

Segmentation is evident in vertebrates in the repeating bony units of their backbones and ribs.
 

9. 

During spiral cleavage, each cell of the blastula rests directly above or below an adjacent cell.
 

10. 

In a cnidarian, endoderm forms the outer tissue and nervous system.
 
 

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

11. 

A group of similar cells organized into a functional unit is called
a.
a nervous system.
c.
a tissue.
b.
specialized cells.
d.
an organ.
 

12. 

Most animals have a head that is located at the ____ end of their body and a tail that is located at the ____ end of their body.
a.
ventral; dorsal
c.
anterior; posterior
b.
dorsal; ventral
d.
posterior; anterior
 
 
      introduction_to_ani_files/i0150000.jpg
 

13. 

Refer to the illustration above. The organism labeled “B” in the diagram
a.
is asymmetrical.
c.
exhibits radial symmetry.
b.
is bilaterally symmetrical.
d.
has reverse symmetry.
 

14. 

Refer to the illustration above. The organism labeled “A” in the diagram
a.
has no symmetry.
c.
exhibits radial symmetry.
b.
is bilaterally symmetrical.
d.
has reverse symmetry.
 

15. 

Which of the following is found in vertebrates but not in invertebrates?
a.
dorsal nerve cord
c.
three germ layers
b.
coelom
d.
bilateral symmetry
 

16. 

A characteristic shared by all chordates at some stage of their development is
a.
a dorsal hollow nerve cord.
c.
pharyngeal pouches.
b.
a notochord.
d.
All of the above
 

17. 

Which of the following is not a characteristic of the largest phylum of invertebrates, the arthropods?
a.
segmentation
c.
closed circulatory system
b.
exoskeleton
d.
digestive tract
 

18. 

The acoelomate body type is exemplified by
a.
flatworms.
c.
mollusks.
b.
roundworms.
d.
annelids.
 

19. 

Which of the following is an incorrect match?
a.
ectoderm—nervous system
c.
endoderm—muscular system
b.
mesoderm—skeletal system
d.
endoderm—digestive system
 
 
The diagrams below are cross sections of three types of animal bodies.
      introduction_to_ani_files/i0230000.jpg
 

20. 

Refer to the illustration above. Humans have the type of body cavity shown in diagram
a.
“A.”
c.
“C.”
b.
“B.”
d.
None of the above
 


 
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