Transcript Slide 1

CAMPBELL BIOLOGY IN FOCUS
Urry • Cain • Wasserman • Minorsky • Jackson • Reece
8
Photosynthesis
Questions prepared by
Brad Stith, University of Colorado Denver
Jung Choi, Georgia Institute of Technology
© 2014 Pearson Education, Inc.
The biomass (dry weight) of a tree comes primarily
from
A. soil.
B. water.
C. air.
D. organic fertilizer (manure, detritus).
E. light.
© 2014 Pearson Education, Inc.
The biomass (dry weight) of a tree comes primarily
from
A. soil.
B. water.
C. air.
D. organic fertilizer (manure, detritus).
E. light.
© 2014 Pearson Education, Inc.
The organic carbon in a tree comes primarily from
A. soil.
B. water.
C. air.
D. organic fertilizer (manure, detritus).
E. light.
© 2014 Pearson Education, Inc.
The organic carbon in a tree comes primarily from
A. soil.
B. water.
C. air.
D. organic fertilizer (manure, detritus).
E. light.
© 2014 Pearson Education, Inc.
The light reactions, which involve the very hydrophobic
chlorophyll, are located here in the chloroplast.
E.
B.
A.
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C.
(lumen)
D.
The light reactions, which involve the very hydrophobic
chlorophyll, are located here in the chloroplast.
E.
B.
A.
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C.
(lumen)
D.
The Calvin cycle reactions are located here in the
chloroplast.
E.
B.
A.
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C.
(lumen)
D.
The Calvin cycle reactions are located here in the
chloroplast.
E.
B.
A.
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C.
(lumen)
D.
What colors of light will drive photosynthesis by
green plants most efficiently?
A. red only
B. yellow only
C. green only
D. blue only
E. red and blue
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What colors of light will drive photosynthesis by
green plants most efficiently?
A. red only
B. yellow only
C. green only
D. blue only
E. red and blue
© 2014 Pearson Education, Inc.
How are the light reactions and the Calvin cycle connected?
A. The light reactions provide ATP to the Calvin cycle, and
the Calvin cycle provides NADPH for the light reactions.
B. The light reactions provide ATP and NADPH to the
Calvin cycle, and the Calvin cycle returns ADP
and NADP to the light reactions.
C. The light reactions provide ATP and NADPH to the Calvin
cycle, and the Calvin cycle returns reduced sugars to the
light reactions.
D. The light reactions provide NADPH to the Calvin cycle,
and the Calvin cycle provides RuBP to the light reactions.
E. The light reactions provide RuBP to the Calvin cycle, and
the Calvin cycle returns G3P to the light reactions.
© 2014 Pearson Education, Inc.
How are the light reactions and the Calvin cycle connected?
A. The light reactions provide ATP to the Calvin cycle, and
the Calvin cycle provides NADPH for the light reactions.
B. The light reactions provide ATP and NADPH to the
Calvin cycle, and the Calvin cycle returns ADP
and NADP+ to the light reactions.
C. The light reactions provide ATP and NADPH to the Calvin
cycle, and the Calvin cycle returns reduced sugars to the
light reactions.
D. The light reactions provide NADPH to the Calvin cycle,
and the Calvin cycle provides RuBP to the light reactions.
E. The light reactions provide RuBP to the Calvin cycle, and
the Calvin cycle returns G3P to the light reactions.
© 2014 Pearson Education, Inc.
In this diagram, compound X is the CO2 acceptor. If
light is cut off, then
A. X and 3PG will both increase.
B. X will increase and 3PG will decrease.
C. X will decrease and 3PG will increase.
D. X and 3PG will both decrease.
© 2014 Pearson Education, Inc.
In this diagram, compound X is the CO2 acceptor. If
light is cut off, then
A. X and 3PG will both increase.
B. X will increase and 3PG will decrease.
C. X will decrease and 3PG will increase.
D. X and 3PG will both decrease.
© 2014 Pearson Education, Inc.
Photorespiration occurs because
A. rubisco can use oxygen as a substrate when
CO2 levels are low and oxygen levels are high.
B. linear electron flow cannot provide the Calvin cycle
with enough ATP.
C. leaf cells use photorespiration to make ATP for
cellular work outside the chloroplasts.
D. C4 plants operate a CO2 shuttle at a cost of extra
ATP, provided by photorespiration.
E. plants need a way to consume the oxygen they
produce.
© 2014 Pearson Education, Inc.
Photorespiration occurs because
A. rubisco can use oxygen as a substrate when
CO2 levels are low and oxygen levels are high.
B. linear electron flow cannot provide the Calvin cycle
with enough ATP.
C. leaf cells use photorespiration to make ATP for
cellular work outside the chloroplasts.
D. C4 plants operate a CO2 shuttle at a cost of extra
ATP, provided by photorespiration.
E. plants need a way to consume the oxygen they
produce.
© 2014 Pearson Education, Inc.
A flask of duckweed in water is placed under a bank of lights on a
12-hour light, 12-hour dark cycle, next to a control flask containing
only water. Assuming no change in water temperature, which flask
will have the lowest dissolved oxygen (DO) concentration, at what
time?
A. DO will be the same between the control and the duckweedcontaining flask.
B. DO will always be higher in the flask with duckweed
compared to the control.
C. DO will always be lower in the flask with duckweed
compared to the control.
D. The flask with duckweed will have the lowest DO at the
end of the dark cycle and the highest DO at the end of
the light cycle.
© 2014 Pearson Education, Inc.
A flask of duckweed in water is placed under a bank of lights on a
12-hour light, 12-hour dark cycle, next to a control flask containing
only water. Assuming no change in water temperature, which flask
will have the lowest dissolved oxygen (DO) concentration, at what
time?
A. DO will be the same between the control and the duckweedcontaining flask.
B. DO will always be higher in the flask with duckweed
compared to the control.
C. DO will always be lower in the flask with duckweed
compared to the control.
D. The flask with duckweed will have the lowest DO at the
end of the dark cycle and the highest DO at the end of
the light cycle.
© 2014 Pearson Education, Inc.
How will increasing atmospheric CO2 levels affect
growth of terrestrial plants?
A. All plants will grow faster.
B. Most plants will be adversely affected.
C. C3 plants will grow faster, with no effect on C4
plants.
D. C4 plants will thrive, while C3 plants will suffer.
E. It depends on changes in the local climate.
© 2014 Pearson Education, Inc.
How will increasing atmospheric CO2 levels affect
growth of terrestrial plants?
A. All plants will grow faster.
B. Most plants will be adversely affected.
C. C3 plants will grow faster, with no effect on C4
plants.
D. C4 plants will thrive, while C3 plants will suffer.
E. It depends on changes in the local climate.
© 2014 Pearson Education, Inc.