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Name: ________________________________________________ Date: _______________ Period: ______
Double Fertilization Tutorial
Directions: Answer the questions below by visiting the following website.
http://bcs.whfreeman.com/thelifewire/content/chp39/3902001.html
Introduction
1. What happens during sexual reproduction?
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2. What does the triploid cell do for a growing embryo? ______________________________________
Click “Animation”
Click “Step Through”
Step Through 1 of 9
3. What delivers sperm cells? ___________________________________________________________
4. Where are sperm cells produced? ______________________________________________________
5. Name the female reproductive organ. ___________________________________________________
Click PLAY
Step Through 2 of 9
6. Circle one: The megaspore is haploid / diploid.
7. How many final megaspores usually develop? ____________________________________________
Click PLAY
Step Through 3 of 9
8. How many haploid nuclei are created as a result of mitosis? _________________________________
9. Name this structure with the eight nuclei. ________________________________________________
Click PLAY
10. Name the opening to the embryo sac. ___________________________________________________
Step Through 4 of 9
11. Where does the egg cell develop? ______________________________________________________
12. Where do the polar nuclei develop? ____________________________________________________
Click PLAY
Step Through 5 of 9
13. Who two parts of the female ovule take place in double fertilization?
a. _______________________________
b. _______________________________
14. What needs to happen before fertilization can take place?
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Click PLAY
Step Through 6 of 9
15. What does the pollen grain land upon? __________________________________________________
16. What connect the pollen grain and the ovary? ____________________________________________
Click PLAY
Step Through 7 of 9
17. What is created when the degenerative cell splits by mitosis? ________________________________
Click PLAY
Step Through 8 of 9
18. What happens to the synergids? _______________________________________________________
19. Circle one: A zygote will become haploid / diploid / triploid.
Click PLAY
Step Through 9 of 9
20. What happens to the 2nd sperm cell? ____________________________________________________
21. Circle one: The endosperm is haploid / diploid / triploid.
22. What is the purpose of the endosperm? _________________________________________________
Click PLAY
Conclusion
23. Define DOUBLE FERTLIZATION.
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24. Name the only plants that perform this process. ___________________________________________
25. Name 3 nutrients stored within the endosperm. ___________________________________________
26. Name the leaves of an embryo. ________________________________________________________
27. Which process do these perform to make food energy? _____________________________________
Quiz
28. Answer to quiz question #1 = _________________________________________________________
29. Answer to quiz question #2 = _________________________________________________________
30. Answer to quiz question #3 = _________________________________________________________