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AP: CHAPTER 10
PHOTOSYNTHESIS
1. What role do autotrophs fill in the biosphere?
2. Indicate the role of each structure within the leaf:
a. Stomates
b. Mesophyll cell
c. Thylakoid membranes
d. Stroma
3. What is the source of oxygen released from photosynthesis?
4. In the overview of photosynthesis, indicate the most significant function of:
a. Light reaction
b. Calvin cycle
5. Light is a form of energy known as
and visible light has a wavelength range of
6. Plant light receptors absorb
and reflect
.
wavelengths of light
wavelengths of light.
8. What does chlorophyll do when excited by photons?
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9. Label the diagram and explain the difference between Photosystem I and Photosystem II.
10. With 2 different colored pencils, follow the energy paths of noncyclic.
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12. To generate ATP, chloroplasts rely on the electron transport chain to
and ATP is synthesized when
13. Within the thylakoid membrane and stroma, indicate what happens to each of the following:
a. Water
b. High energy electrons
c. H+
d. Oxygen
e. NADP+
f. ADP
14. Where in the chloroplast is the H+ concentration highest?
15. What happens during carbon fixation?
16. List the materials the plant uses during the Calvin cycle and the sources of the materials.
17. The products of the Calvin cycle are
18. Why do high oxygen levels inhibit photosynthesis?
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20. The following diagram represents an experiment with isolated thylakoids. The thylakoids were first made
acidic by soaking them in a solution of pH 4. After the thylakoids space reached pH 4, the thylakoids
where transferred to a basic solution of pH 8. The thylakoids then made ATP in the dark.
Draw an enlargement of part of the thylakoid membrane in the beaker with the solution at pH 8. Draw
ATP synthase. Label the areas of high H+ concentration and low H+ concentration. Show the direction
protons flow through the enzyme, and show the reaction where ATP is synthesized. Would ATP end up in
the thylakoid or outside of it? Explain why the thylakoids in the experiment were able to make ATP in the
dark.
21. Which process is most directly driven by light energy?
a.
b.
c.
d.
creation of a pH gradient by pumping protons across the thylakoid membrane
carbon fixation in the stroma
reduction of NADP+ molecules
removal of electrons from chlorophyll molecules
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22. All of the following statements about photosynthesis are true EXCEPT
a. the light reaction converts solar energy to chemical energy in the form of ATP and
NADPH
b. the calvin cycle uses ATP and NADPH to convert CO2 to sugar
c. Photosystem I contains P700 chlorophyll a molecules at the reaction center; photosystem II
contains P680 molecules
d. in chemiosmosis, electrons transport chains pump protons across a membrane from a
region of high H+ concentration to a region of low H+ concentration
e. the steps of the Calvin cycle use ATP and NADPH to convert CO2 to sugar
23. The major product of the Calvin cycle is
a.
b.
c.
d.
e.
rubisco
oxaloacetate
ribulose bisphosphate
pyruvate
glyceraldehyde 3-phosphate
24. Carbon dioxide absorption is an appropriate indicator of photosynthesis because
a.
b.
c.
d.
CO2 is needed to produce sugars in the Calvin cycle
CO2 is needed to complete the light reaction
plants produce oxygen gas by splitting CO2
the energy in CO2 is used to produce ATP and NADPH
25. In a mesophyll cell of a leaf, the synthesis of ATP occurs in which of the following?
I. Ribosomes
II. Mitochondria
III. Chloroplast
a.
b.
c.
d.
e.
I only
II only
III only
II and III only
I, II, and III
26. On a sunny day, the closing of stomata in plant leaves results in
a.
b.
c.
d.
a decrease in CO2 uptake
a shift from C3 photosynthesis to C4 photosynthesis
in increase in transpiration
an increase in the concentration of CO2 in mesophyll
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27. The rate of photosynthesis may vary with changes that occur in environmental temperature, wavelength of
light, and light intensity. Using a photosynthetic organism of your choice, choose only ONE of the three
variables (temperature, wavelength of light, or light intensity) and for this variable design a scientific
experiment to determine the effect of the variable on the rate of photosynthesis for the organism.
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