Photosynthesis Practice Multiple Choice NEL
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. A photoautotroph is an organism that
5. Which of these best describes the action of
a. cannot synthesize complex molecules, but gains
chlorophyll b?
energy from light.
a. It is contained within photosystem I, but not
b. can synthesize complex molecules, using light
photosystem II.
energy.
b. It absorbs light energy at wavelengths of
c. can synthesize complex molecule, using the
approximately 400 nm and 700 nm.
energy stored in chemical bonds.
c. It is an accessory pigment, and contained
d. can synthesize complex molecules using energy
within an antenna complex.
from chemical reactions.
d. It is contained within photosystem II, but not
photosystem I.
2. In the leaves of most plants, where can chloroplasts
be found?
6. The energy from the light absorbed in the
a. in the upper epidermis and palisade mesophyll
chloroplast by P680 energizes an electron. What
tissues only.
does the electron do as a result?
b. in the palisade and spongy mesophyll tissue
a. It transfers to PQ, which also moves protons.
only.
b. It immediately forms ATP.
c. in the upper epidermis, palisade, and spongy
c. It immediately forms NADPH.
mesophyll tissues only.
d. It transfers to ferredoxin, which also moves
d. in the palisade and spongy mesophyll tissues,
protons.
and the guard cells of epidermal tissue.
7. Which series of events is triggered by the light
3. Predict which of these factors will have the greatest
energy absorbed by photosystem II in the
effect on stomatal opening and closing.
chloroplast?
a. air temperature, brightness of ambient light,
a. It causes water to be broken into oxygen,
and humidity only
protons and electrons.
b. air temperature, brightness of ambient light,
b. It causes an increase in proton concentration in
turgor pressure of the guard cells, and humidity
the stroma.
c. air temperature, water content in the soil,
c. It causes a decrease in proton concentration in
brightness of ambient light, turgor pressure of
the lumen of the thylakoid.
the guard cells, and humidity
d. It energizes an electron transfers to ferredoxin,
d. air temperature, turgor pressure of the guard
which also moves protons.
cells, and humidity only
8. In the chloroplast, light energy absorbed by P700
4. What is true of chlorophyll a?
energizes an electron that does which of the
a. It is contained photosystem I, but not
following?
photosystem II.
a. It immediately forms ATP.
b. It is contained photosystem II, but not
b. It transfers to ferredoxin, which then forms
photosystem I.
NADPH.
c. It is the primary electron acceptor.
c. It immediately forms NADPH.
d. It absorbs light energy at wavelengths of
d. It transfers to PQ, which causes protons to enter
approximately 600 nm and 900 nm.
the lumen.
9. What is the result of light energy absorbed by
photosystem I?
a. It energizes an electron that transfers to
ferredoxin, which causes protons to leave the
lumen.
b. It loses electrons that are replaced by water.
c. It energizes an electron that transfers to
ferredoxin, which then forms NADPH.
d. It energizes an electron that transfers to
ferredoxin, which causes protons to enter the
lumen.
10. Predict where land plants obtain most of the matter
that they fix into their tissues (such as their foliage,
wood, or roots), as a result of photosynthesis.
a. the atmosphere
b. water absorbed through the roots
c. carbon fixing bacteria in the roots
d. carbonates in the soil
11. Predict which of the following processes is most
likely to cause water molecules to move up the
stem or trunk of a land plant.
a. transpiration
b. transcription
c. photorespiration
d. translation
14. Which statement about the Calvin cycle is true?
a. Reduction occurs.
b. ATP molecules are needed to keep the
reactions going.
c. Carbon fixation occurs.
d. All of the above.
15. Which of these best describes the action of the
Calvin Cycle?
a. It uses CO2 from the atmosphere, and ATP and
NADPH from the light-dependent reactions.
b. It takes six cycles to reform RuBP, and three
cycles to produce glucose.
c. It can take place only in darkness.
d. One molecule of carbon dioxide is fixed in
three cycles.
16. Predict which of the following products of
photosynthesis is important for cycling of matter in
an ecosystem.
a. splitting of water in the light-dependent
reactions
b. release of oxygen in the light-dependent
reactions
c. production of glucose in the light-independent
reactions
d. all of the above
12. How is linear electron transport best described?
a. cyclic electron transport in which ATP are
produced for use in the Calvin cycle, but not
NADPH nor oxygen
b. cyclic electron transport in which ATP and
NADPH are produced for use in the Calvin
cycle, but not oxygen
c. non-cyclic electron transport in which ATP and
oxygen are produced for use in the Calvin
cycle, but not NADPH
d. non-cyclic electron transport in which ATP,
NADPH and oxygen are produced for use in
the Calvin cycle
17. Which of the following is most dependent on the
energy from solar radiation?
a. the production of ATP
b. the fixation of carbon dioxide
c. the excitation of chlorophyll
d. the transfer of energy from chlorophyll to
carbon dioxide
13. How is the production of ATP in the chloroplast by
the transfer of electrons and protons, but without
the formation of NADPH or oxygen described?
a. cyclic electron transport
b. non-cyclic electron transport
c. light independent reactions
d. light dependent reactions
19. Which of the following is most important energy
source for the process of photophosphorylation?
a. light
b. oxidative phosphorylation
c. light and oxidative phosphorylation
d. substrate level and oxidative phosphorylation
18. What does photophosphorylation refer to?
a. the synthesis of ATP by photolysis
b. the synthesis of glucose via carbon fixation
c. the reduction of NADPH by electron transport
d. the synthesis of ATP using light
20. With respect to the Laws of Thermodynamics, what
is the most important of the following roles of the
electrons that are released as a result of photolysis?
a. They are used directly in the fixation of carbon
during the Calvin cycle.
b. They combine with H+ ions and oxygen to form
water.
c. They reduce photosystem II chlorophyll
molecules.
d. They reduce photosystem I chlorophyll
molecules.
21. By the end of the light reactions, which of these has
taken place?
a. the breakdown of ATP and water
b. G3P has formed and carbon dioxide has been
absorbed
c. ATP has formed and carbon dioxide has been
absorbed
d. the formation of ATP and NADPH + H+
22. Evaluate which of the following choices contains
the greatest amount of energy captured by
chlorophyll a and converted to chemical energy.
a. other chlorophylls
b. a series of hydrogen acceptors
c. carbon dioxide
d. carotenoids
23. What does photophosphorylation involve?
a. water
b. a proton gradient across the stroma
c. chlorophyll b
d. the production of ATP
24. Which of these statements concerning photolysis is
correct?
a. It produces oxygen gas.
b. It occurs in the thylakoid of the chloroplast.
c. all of the above
d. none of the above
25. In photosynthesis, where does the oxygen that is
released come from?
a. an intermediate of the Calvin cycle
b. carbon dioxide
c. chlorophyll
d. water
26. Evaluate which of the following is the most
important outcome of photosynthesis for the
biosphere.
a. buffering pH
b. release of molecular oxygen
c. activating chlorophyll
d. supplying of free electrons
27. Which of these best describes what occurs in the
light dependent reactions?
a. ATP is produced by the flow of protons
b. oxygen is produced to provide a source of
electrons and protons
c. NADPH is produced by the flow of electrons
d. all of the above
28. What is the equation for photosynthesis?
a. 6 CO2 + 12 H2O + 12 NADP + 18 ADP
C6H12O6 + 6 H2O + 6 O2
b. CO2 + H2O
C6H12O6 + O2
c. 6 CO2 + 6 H2O
C6H12O6 + 6 O2
d. 6 CO2 + 12 H2O
C6H12O6 + 6 H2O + 6 O2
29. What does carbon dioxide combine with during
photosynthesis?
a. ribulose bisphosphate
b. water
c. NAD+
d. G3P
30. What is required to convert Ribulose bisphosphate
to 3-phosphoglycerate (PGA)?
a. the addition of G3P and carbon dioxide
b. the addition of oxygen and glucose
c. the addition of oxygen and G3P
d. the addition of carbon dioxide and water
31. What will six cycles of the Calvin cycle produce?
a. one molecule of glucose and six molecules of
RuBP
b. one molecule of glucose and three molecules of
RuBP
c. two molecules of glucose and six molecules of
RuBP
d. half of one molecule of glucose and three
molecules of RuBP
32. What is a product of carbon fixation during
photosynthesis?
a. NADPH
b. ATP
c. 3-phosphoglycerate
d. oxygen
38. Which of these is characteristic of CAM plants?
a. specialized leaf anatomy
b. photosynthesis more likely to occur at lower
temperatures
c. stomata open at night
d. none of the above
33. When there is light, plants release oxygen. What
else may plants also use oxygen in?
a. photosynthesis
b. photorespiration
c. photolysis
d. photophosphorylation
39. What is a cost associated with the C4/CAM
pathways?
a. ATP
b. glucose
c. oxygen
d. water
34. Evaluate which of the following is the greatest
effect of global warming on photorespiration in
land plants.
a. an increase in temperature, which leads to
increased oxygenase activity
b. elevated oxygen levels in the leaves due to
cellular respiration
c. an increase in light intensity
d. elevated carbon dioxide levels in the leaves due
to photosynthesis
40. A fig plant in a planter has a total mass of 1 kg.
Two weeks later, the mass of the plant and planter
has increased to 2 kg. What is the most likely
source of the additional mass?
a. atmospheric carbon dioxide
b. water
c. NADPH
d. minerals
35. What does the “4” in C4 refer to?
a. the number of different types of cells needed to
run the Calvin cycle
b. the number of carbons in the first product of the
Calvin cycle
c. the number of carbons joined together when
PEP is carboxylated
d. the number of carbons is takes to produce one
molecule of PGA
36. Which of these are characteristic of C4 plants?
a. specialized leaf anatomy
b. photosynthesis is more likely to occur at higher
temperatures
c. bundle-sheath cells surrounded by mesophyll
cells
d. all of the above
37. What is true of CAM plants?
a. Carbon fixation and the light-independent
reactions do not occur at the same time of day.
b. They are often desert plants.
c. The carbon dioxide is fixed to produce malate.
d. All of the above.
41. A bean plant is placed in an experimental chamber
and the amount of gases consumed and released is
monitored. Predict which of the following gases is
produced during periods of darkness.
a. oxygen
b. nitrogen
c. water
d. carbon dioxide
42. During periods of darkness, which of the following
is most likely to occur?
a. carbon fixation
b. release of oxygen
c. splitting of water
d. reduction of NADP+
43. During an investigation of factors affecting the rate
of photosynthesis, light of different colours is
shown on experimental plants and the amount of
oxygen released is measured. If all other factors are
controlled, predict which of the following colours
will result in the highest production of oxygen.
a. yellow
b. green
c. red
d. none of the above
44. As a result of global climate change, predict which
of the following plants is most likely to benefit
from the increase in temperature.
a. spruce
b. corn
c. C3 plants
d. pine
45. What are the primary producers on Earth?
a. chemoautotrophs
b. photoautotrophs
c. decomposers
d. none of the above
Photosynthesis Practice Multiple Choice NEL
Answer Section
MULTIPLE CHOICE
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OBJ: 5.1 Photosynthesis: An Introduction
OBJ: 5.1 Photosynthesis: An Introduction
OBJ: 5.1 Photosynthesis: An Introduction
OBJ: 5.1 Photosynthesis: An Introduction
OBJ: 5.1 Photosynthesis: An Introduction
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.1 Photosynthesis: An Introduction
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
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5.4 Alternative Mechanisms of Carbon Fixation
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Analysis and Application
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OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.1 Photosynthesis: An Introduction
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
OBJ: 5.2 Pathways of Photosynthesis
LOC: C2.1
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5.1 Photosynthesis: An Introduction
5.1 Photosynthesis: An Introduction
5.1 Photosynthesis: An Introduction
5.1 Photosynthesis: An Introduction
OBJ: 5.1 Photosynthesis: An Introduction