Biology (Mader), 10th Edition

Chapter 42: Animal Development

Pre-Test

1
Enzymes associated with the _____ of the sperm help the sperm penetrate the egg.
A)head
B)tail
C)midpiece
2
Gastrulation is complete when _____.
A)the blastocoel develops
B)three layers of cells are present
C)the egg nucleus fuses with the sperm nucleus
D)the ectoderm and endoderm are present
3
The _____ is the outer germ layer.
A)ectoderm
B)endoderm
C)mesoderm
4
Which of the choices is the correct order of embryonic stages?

1. Blastula
2. Zygote
3. Morula
4. Gastrula

A)3, 2, 1, 4
B)2, 4, 3, 1
C)2, 3, 1, 4
D)3, 2, 4, 1
5
The _____ is a cavity in the blastula.
A)blastocoel
B)coelom
C)hemocoel
D)archenteron
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