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Name ______________________________ Class___________________Date__________________ Skills Worksheet Directed Reading A Section: Animal Reproduction 1. Why is it necessary for members of a species to reproduce? _______________________________________________________________ _______________________________________________________________ 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? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 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 1 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? _______________________________________________________________ 17. Why is variation of genes an advantage of sexual reproduction? _______________________________________________________________ _______________________________________________________________ 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 3 Adapting to the Environment