Name:____________________________________________________pd___________date________
Photosynthesis Overview – Biology
Use the textbook and answer the following questions.
1. p. 204 What occurs in the process of photosynthesis?
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2. p. 206 Write the overall equation for photosynthesis using words.
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3. Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into oxygen and high
energy _________________________________
4. p. 207. What does photosynthesis require in addition to water and carbon dioxide?
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5. Plants gather the sun’s energy with light-absorbing molecules called _________________________
6. What is the principal pigment of plants? _______________________________________________
7. Circle the letters of the regions of the visible spectrum in which chlorophyll absorbs light very well
a. blue-violet region
b. green region
c. red region
d. yellow region
8. p. 208 Chloroplasts contain saclike photosynthetic membranes called ________________________
9. What is a granum?
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10. The region outside the thylakoid membranes in the chloroplasts is called the? ________________
11. What are the two stages of photosynthesis called?
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12. P. 209 NADPH acts as a what? _______________________________________________________
13. p 210-211 Circle the letter of each sentence that is true about the light –dependent reactions
a. they convert ADP to ATP b. they produce oxygen gas c. they convert oxygen into carbon dioxide
d. they convert NADP+ into NADPH (produce electron carriers)
14. Where do the light-dependent reactions take place?_______________________________________
15. Circle the letter of each sentence that is true about the light –dependent reactions
a. high energy electrons move through the electron transport chain from photosystem II to
photosystem I
b. photosynthesis begins when pigments in photosystem I absorb light
c. the differences in charges across the thylakoid membrane provides the energy to make ATP
d. pigments in photosystem I use energy from light to reenergize electrons
16. What is ATP synthase used for? ____________________________________________________
a. Where have you seen this before? ___________________________________________
17. p.212-214 What does the Calvin cycle use to produce high –energy sugars?
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18. Why are the reactions of the Calvin cycle also called the light-independent reactions?
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19. Circle the letter of each statement that is true about the Calvin Cycle
a. the main products of the Calvin cycle are six carbon dioxide molecules
b. carbon dioxide molecules enter the Calvin cycle from the atmosphere
c. energy from ATP and high-energy electrons from NADPH (electron carriers) are used to
convert 3-Carbon molecules into higher –energy forms.
d. the Calvin cycle uses six molecules of carbon dioxide to produce a single 6-carbon sugar
molecule.
20. p. 214 List three factors that affect the rate at which photosynthesis occurs.
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Review
21. What is an organism that obtains energy from the food it consumes? _________________________
22. What is an organism that is able to produce its own food? _______________________________
23. What is released when the bond is broken between phosphate groups of an ATP molecule?
_________________________________
24. What are the reactants for photosynthesis? ____________________________________________
25. What are the products for photosynthesis? _____________________________________________