Skills Worksheet Directed Reading A

Name ______________________________ Class___________________Date__________________ Skills Worksheet

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 sexually?

_______________________________________________________________ 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

c. sperm

b. DNA

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

Original content Copyright ? by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science and Technology

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Reproduction and Development

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.

a. monotreme b. placental mammal c. marsupial

_____ 19. The female lays eggs that hatch and then nourishes them with milk.

Original content Copyright ? by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science and Technology

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Reproduction and Development

Name ______________________________ Class___________________Date__________________

Directed Reading A continued

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

Original content Copyright ? by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science and Technology

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Reproduction and Development

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