Download 01 - Cobb Learning

Name ______________________________ Class ___________________ Date __________________
Ch. 26-1 Directed Reading A
Section: Animal Reproduction
1. Why is it necessary for living things to reproduce?
_______________________________________________________________
ASEXUAL REPRODUCTION
2. In particular, what type of animals reproduce asexually?
_______________________________________________________________
3. Offspring produced by asexual reproduction are
______________________identical to the single parent.
4. When a part of a parent organism pinches off and forms a new organism, it is
called. ______________________
5. When an organism reproduces by ______________________, parts of it break
off and develop into an identical individual.
6. A sea star reproduces by. ______________________
SEXUAL REPRODUCTION
_____ 7. In sexual reproduction, two parents contribute to the offspring’s
a. genes.
c. eggs.
b. nucleus.
d. parents.
_____ 8. What is a female’s sex cell called?
a. zygote
c. gene
b. egg
d. sperm
_____ 9. What is a male’s sex cell called?
a. penis
b. DNA
c. sperm
d. zygote
_____ 10. The union of a male’s sex cell with a female’s sex cell is called
a. meiosis.
c. fertilization.
b. generations.
d. chromosomes.
_____ 11. All human cells, except sex cells and mature red blood cells, contain
how many chromosomes?
a. 46
c. 23
b. 2
d. 12
Name ______________________________ Class ___________________ Date __________________
Directed Reading A continued
_____ 12. The number of chromosomes in sex cells is produced by a cell division
process called
a. combination.
c. meiosis.
b. fertilization.
d. a zygote.
INTERNAL AND EXTERNAL FERTILIZATION
_____ 13. What occurs during external fertilization?
a. The sperm fertilizes eggs outside the female’s body.
b. The female must find water.
c. The male puts sperm inside the female.
d. The female produces both eggs and sperm.
_____ 14. Which of the following is an advantage of internal fertilization?
a. More offspring are produced.
b. It’s easier to find a mate.
c. The males produce fewer sperm.
d. The fertilized eggs are protected.
_____ 15. Many mammals that use internal fertilization give birth to live young
that develop
a. inside an egg.
c. inside a pouch.
b. inside the female’s body.
d. in a dry environment.
MAMMALS
_____ 16. All mammals reproduce sexually and feed their young on
a. milk.
c. eggs.
b. seeds.
d. blood.
Match the correct description with the correct term. Write the letter in the space
provided.
_____ 17. The female nourishes young inside her
body before birth.
_____ 18. The partially developed young continue
to develop inside the mother’s pouch.
_____ 19. The female lays eggs that hatch and then
nourishes them with milk.
a. monotreme
b. placental mammal
c. marsupial
Name ______________________________ Class ___________________ Date __________________
For each type of mammal listed, write whether it is a marsupial, a placental
mammal, or a monotreme.
20. ______________________ human
21. ______________________ platypus
22. ______________________ opossum
23. ______________________ echidna
24. ______________________ kangaroo
25. ______________________ bat
Reproduction Review
Complete this worksheet after you finish reading the section “Animal Reproduction.”
Different organisms reproduce in different ways. Fill in the table below by circling the
correct type of reproduction. Then, indicate the organism’s method of fertilization and
where the embryo develops. Several boxes have been filled in to get you started.
Organism
Type of reproduction
Method of
fertilization
Where the embryo
develops
Hydra
asexual or sexual
Zebra
asexual or sexual
Chicken
asexual or sexual
Frog
asexual or sexual
Sea star
asexual or sexual
Echidna
asexual or sexual
in eggs outside the
mother
Human
asexual or sexual
inside the mother
Kangaroo
asexual or sexual
none (no embryo)
none