Download Directed Reading A Section: Animal Reproduction

Name ______________________________ Class___________________Date__________________
Skills Worksheet
Directed Reading A
Section: Animal Reproduction
1. Why is it necessary for members of a species to reproduce?
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ASEXUAL REPRODUCTION
2. In ______________________, a single parent produces offspring.
3. An offspring produced by asexual reproduction is ______________________
to its parent.
4. What are two advantages of asexual reproduction?
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5. When a part of a parent organism pinches off and forms a new
organism, it is called ______________________.
6. Part of an organism breaks off, and new parts regenerate to form a new
individual in the kind of asexual reproduction called
______________________.
7. Some organisms, such as the sea star, have the ability
to ______________________ body parts.
SEXUAL REPRODUCTION
_____ 8. In sexual reproduction, two parents each contribute part of the
offspring’s
a. genetic information.
c. eggs.
b. upbringing.
d. birth.
_____ 9. What is a female sex cell called?
a. zygote
b. egg
c. gene
d. sperm
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
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Adapting to the Environment
Name ______________________________ Class___________________Date__________________
Directed Reading A continued
_____ 10. What is a male sex cell called?
a. egg
b. DNA
c. sperm
d. zygote
_____ 11. The union of a sperm with an egg is called
a. fragmentation.
c. fertilization.
b. regeneration.
d. courting.
_____ 12. A fertilized egg is called a
a. zygote.
b. sperm.
c. cyclops.
d. gene.
_____ 13. Where is genetic information found?
a. in atoms
c. in genes
b. in birth
d. in food
_____ 14. What is the location of genes?
a. on chromosomes made of protein and DNA
b. in special molecules made of eggs and sperm
c. on chromosomes made of fats and protein
d. in special molecules made of fats and DNA
15. The combination of genes from two parents results in a zygote that grows
into a(n) ______________________.
16. What does the combination of genes in sexual reproduction allow for?
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17. Why is variation of genes an advantage of sexual reproduction?
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INTERNAL AND EXTERNAL FERTILIZATION
_____ 18. What occurs during external fertilization?
a. The sperm fertilizes eggs outside the female’s body.
b. The male produces eggs and sperm.
c. The male puts sperm inside the female.
d. The female produces both eggs and sperm.
_____ 19. Why must external fertilization take place in a moist environment?
a. so that the eggs are protected
b. so that the zygotes won’t dry out
c. because the environment is warmer
d. because the environment is cooler
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
2
Adapting to the Environment
Name ______________________________ Class___________________Date__________________
Directed Reading A continued
_____ 20. Which of the following is an advantage of internal fertilization?
a. More offspring are produced.
b. It is easier to find a mate.
c. The males produce fewer sperm.
d. The fertilized eggs are protected.
_____ 21. Most mammals 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
_____ 22. All mammals reproduce sexually and feed their young
a. milk.
c. eggs.
b. seeds.
d. blood.
Match the correct description with the correct term. Write the letter in the space
provided.
_____ 23. The female nourishes young inside her
body before giving birth to well-developed
newborns.
a. monotreme
b. placental
mammal
c. marsupial
_____ 24. The female gives birth to partially
developed young that continue to develop
inside the mother’s pouch.
_____ 25. The female lays eggs that hatch, then
nourishes her young with milk.
For each type of mammal listed, write whether it is a marsupial, a placental
mammal, or a monotreme.
_____________________ 26. human
_____________________ 27. platypus
_____________________ 28. opossum
_____________________ 29. echidna
_____________________ 30. kangaroo
_____________________ 31. armadillo
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
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Adapting to the Environment