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AP Biology Reading Guide Chapter 10: Photosynthesis

Fred and Theresa Holtzclaw

Copyright © 2010 Pearson Education, Inc. - 1 -

Name_______________________Period___________

Chapter 10: Photosynthesis

This chapter is as challenging as the one you just finished on cellular respiration. However,

conceptually it will be a little easier because the concepts learned in Chapter 9—namely,

chemiosmosis and an electron transport system—will play a central role in photosynthesis.

1. As a review, define the terms autotroph and heterotroph. Keep in mind that plants have

mitochondria and chloroplasts and do both cellular respiration and photosynthesis!

Concept 10.1 Photosynthesis converts light energy to the chemical energy of food

2. Take a moment to place the chloroplast in the leaf by working through Figure 10.3. Draw a

picture of the chloroplast and label the stroma, thylakoid, thylakoid space, inner membrane,

and outer membrane.

3. Use both chemical symbols and words to write out the formula for photosynthesis (use the one

that indicates only the net consumption of water). The formula is the opposite of cellular

respiration. You should know both formulas from memory.

4. Using

18

O as the basis of your discussion, explain how we know that the oxygen released in

photosynthesis comes from water.

5. Photosynthesis is not a single process, but two processes, each with multiple steps.

a. Explain what occurs in the light reactions stage of photosynthesis. Be sure to use NADP

+

and photophosphorylation in your discussion.

b. Explain the Calvin cycle, utilizing the term carbon fixation in your discussion. AP Biology Reading Guide Chapter 10: Photosynthesis

Fred and Theresa Holtzclaw

Copyright © 2010 Pearson Education, Inc. - 2 -

6. The details of photosynthesis will be easier to organize if you can visualize the overall process.

Label Figure 10.5, below. As you work on this, underline the items that are cycled

between the light reactions and the Calvin cycle.

Concept 10.2 The light reactions convert solar energy to the chemical energy of ATP and NADPH

This is a long and challenging concept. Take your time, work through the questions, and realize that

this is the key concept for photosynthesis.

7. Some of the types of energy in the electromagnetic spectrum will be familiar, such as X-rays,

microwaves, and radio waves. The most imporant part of the spectrum in photosynthesis is

visible light. What are the colors of the visible spectrum?

Notice the colors and corresponding wavelengths and then explain the relationship between

wavelength and energy.

8. Read Figure 10.9 carefully; then explain the correlation between an absorbtion spectra and an

action spectrum.

9. Describe how Englemann was able to form an action spectrum long before the invention of a

spectrophotometer. AP Biology Reading Guide Chapter 10: Photosynthesis

Fred and Theresa Holtzclaw

Copyright © 2010 Pearson Education, Inc. - 3 -

10. A photosystem is composed of a protein complex called a ___________-__________ complex

surrounded by several __________-____________ complexes.

11. Within the photosystems, the critical conversion of solar energy to chemical energy

occurs. This process is the essence of being a producer! Using Figure 10.12 as a guide, label the

diagram and then explain the role of the terms in the photosystem.

a) Reaction center complex—

b) Light-harvesting complex—

c) Primary electron acceptor—

12. Photosystem I is referred to by the wavelength at which its reaction center best absorbs light, or

P__________; photosystem II is also known by this characteristic, or P__________. AP Biology Reading Guide Chapter 10: Photosynthesis

Fred and Theresa Holtzclaw

Copyright © 2010 Pearson Education, Inc. - 4 -

13. Linear electron flow is, fortunately,...
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