Name
Date
Class
Chapter 8 Lesson 3
Animal Reproduction and Fertilization
Understanding Main Ideas
Answer the following questions in the spaces provided.
1. Why do animals reproduce?
2. How do animals reproduce asexually?
3. How do animals reproduce sexually?
4. What is the difference between external and internal fertilization?
Building Vocabulary
Match each term with its definition by writing the letter of the correct definition in the
right column beside the term in the left column.
5. ___ larva
6. ___ polyp
a. fertilization that takes place inside the female
organism’s body
b. a body form that looks like an open umbrella
7. ___ medusa
c. an immature form of an animal that looks different
from the adult
8. ___ external fertilization
d. the length of time between fertilization and birth
9. ___ internal fertilization
e. a body form that looks like an upright vase
10. ___ gestation period
f.
fertilization that takes place outside the female
organism’s body
Name
Date
Class
Chapter 8 Lesson 3
Animal Reproduction and Fertilization
Fill in the blank to complete each statement.
1. _____________ reproduction requires only one parent organism.
2. Most vertebrates and most invertebrates reproduce _____________.
3. Sponges reproduce asexually when a new sponge grows from a parent and breaks off in a process
called _____________.
4. _____________ may occur either inside or outside the female organism’s body.
5. External fertilization usually occurs in _____________ so that the egg and sperm cells do not dry out.
If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
6. _____________ Sexual reproduction requires a mate.
7. _____________ Offspring from asexual reproduction have different DNA than the parent(s).
8. _____________ A(n) polyp is a cnidarian body form that looks like an open umbrella.
9. _____________ Internal fertilization occurs inside the female organism’s body.
10. _____________ The length of time between fertilization and birth is called the fertilization period.