The Scientific Method - Florida State College by DL45eFVt

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									                  Photosynthesis
This chapter will deal with photosynthesis: the series of chemical reactions in
plants and other organisms that use carbon dioxide to form food (carbohydrates)

A)    Web site name: Florida State College Jacksonville

      Web URL: http://web.fscj.edu/David.Byres/photosyn.html


Read the section on Photosynthesis

1)    What does “photo synthesis” literally mean ? _________________________
      _____________________________________________________________

2)    In which country was Van Helmont born? ___________________________

3)    What did Van Helmont’s experiment show about plants ? _______________
      _____________________________________________________________

4)    In 1766 Joseph Priestley had a meeting with _________________________

5)    How did Joseph Priestley find that plants produce oxygen ? _____________
      _____________________________________________________________
      _____________________________________________________________

6)    What type of drink did Priestley invent? ____________________________
      _____________________________________________________________

7)    What did Jan Ingenhousz discover about photosynthesis? _______________
      _____________________________________________________________
      _____________________________________________________________

8)    What two colors of light are most effective in photosynthesis ?
            _________________ and ________________
      B)    Web site name: New Scientist magazine

             URL: http://www.newscientist.com/article/dn16124-solarpowered-
      sea-slug-harnesses-stolen-plant-genes-.html

9)    What is the scientific name for this green sea slug?
      ____________________             _______________________

10)   What does it feed on? ___________________________________________

11)   For how much of its life does the sea slug need to eat? _________________

12)  Explain in your own words what “mystery” remained?
     _____________________________________________________________
__________________________________________________________________
__________________________________________________________________
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13)   What is the scientific name of the sea slugs favorite food?
      _________________________            __________________________

14) Why is it important that researchers found the algal gene in the sea slugs’ sex
     cells? ________________________________________________________
    _____________________________________________________________

15)  Why could humans not become photosynthetic?
     _____________________________________________________________
__________________________________________________________________

C)    Web site name: Online Biology Book
      Web URL: http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookPS.html


16)   Which two living things, apart from plants, can carry out photosynthesis?
      ________________________________________________________

17)   Write down the chemical equation for photosynthesis :
      ___________________________________________________________

18)   What is the function of xylem? _________________________________
19)   How does carbon dioxide enter the leaf?
      ___________________________________________________________

20)   What is a pigment? ________________________________________

21)   Where in the chloroplast do the Light Reactions take place ? ____________

22)   In the light reactions the energy is converted into: __________ and
      ______________.

23)   Which photosystem ( P680 or P700 ) splits water ? _________________

24)   Where do “halobacteria” live? ___________________________________

25)   When did Calvin win the Nobel Prize for Chemistry? _________________


D.    Web site name: Arizona State University
      Web URL: http://photoscience.la.asu.edu/photosyn/study.html

Read “Why study photosynthesis”

26)   What three examples of stored energy come from photosynthesis?
      _____________________________________________________________

27)   What does a plant use carbohydrates for? ____________________________

28)   What country uses ethanol as a major automobile fuel? _________________

29)   What is the connection between plastics and photosynthesis? ____________
      _____________________________________________________________

30)   Why does photosynthesis counteract the effect of combustion of fossil fuels?
      _____________________________________________________________

31)  List one more reason that photosynthesis is important:
     _____________________________________________________________
__________________________________________________________________
__________________________________________________________________
E.   Web site name: Scientific American
     Web URL: http://www.sciam.com/article.cfm?articleID=0005DF26-7ABD-
1D94-9275809EC5880105&sc=I100322

Read “The Warm Hues of Fall Foliage”

32)  What was the original explanation for the red color of fall leaves, back at the
     turn of the 20th century?
__________________________________________________________________
______________________________________________________________


33) Why does sunlight do more damage to the leaf in the fall than in the summer?
    _______________________________________________________________


34) What experiment with dogwood leaves supports the idea of the red color being
    sunscreen?
__________________________________________________________________
__________________________________________________________________


35) What parts of the cell can be damaged by “free radicals”?
____________________________________________________________


36) Why does Linda Chalker-Scott disagree with the “sunscreen” idea?
______________________________________________________________


37) What other explanations have been suggested for the red colors?
__________________________________________________________________
________________________________________________________________


38) Why do none of the theories fully explain the red colors of fall?
__________________________________________________________________
__________________________________________________________________
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F.    Web site name: Science Daily
      URL: http://www.sciencedaily.com/releases/2008/07/080731143345.htm

39)   What barrier to solar power has been overcome? _____________________
      _____________________________________________________________

40)   Who is the senior author of this paper?
      _____________________________________________________________

41)  What is the connection here with photosynthesis? _____________________
     _____________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________

42)  What new catalyst is used in this process?
     _____________________________________________________________
__________________________________________________________________

43)   “In one hour, enough sunlight strikes the earth to _____________________
      _____________________________________________________________

44)  What are two problems with current electrolyzers?
     _____________________________________________________________
__________________________________________________________________

45)  Do you agree with Nocera’s estimate that houses could be powered by the
     sun in 10 years? Give your reasons.
__________________________________________________________________
__________________________________________________________________
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