Transcript 07_Clicker_Questions

Chapter 7
Photosynthesis: Using Light to
Make Food
Clicker Questions for use with Classroom Response Systems
Campbell Essential Biology, Fourth Edition
– Simon, Reece, and Dickey
Campbell Essential Biology with Physiology, Third Edition
– Simon, Reece, and Dickey
Questions prepared by Brad Williamson, updated by Mike Tveten
© 2010 Pearson Education, Inc.
Concept Check
The image on the right is
the summary equation
for the process of
photosynthesis. This
reaction
•
produces products with
higher stored energy (it
is endergonic).
•
releases energy (it is
exergonic).
•
has an equal amount of
energy in the reactants
and the products.
•
is catabolic.
© 2010 Pearson Education, Inc.
Concept Check
Both cellular respiration and photosynthesis rely on
electron transport chains embedded in membranes to
produce ATP molecules. Which of the following correctly
describes the difference between the two types of
electron transport chains?
a. In cellular respiration, the electron source is water and
the final electron destination is oxygen.
b. In cellular respiration, the electron source is energyrich food and the final electron destination is oxygen.
c. In photosynthesis, the electron source is water and the
final electron destination is oxygen.
d. Both b and c.
© 2010 Pearson Education, Inc.
Concept Check
When a photon of the correct
energy is absorbed by a
photosystem, an electron is
energized and transferred to a
primary electron acceptor. This
creates an electron “hole.” How is
the missing electron replaced?
a. An electron removed from
glucose replaces the
missing electron.
b. An electron from
hydrogen made available
by splitting water replaces
the missing electron.
c.
The electron comes from
ATP.
d. The replacement electron
comes from NADPH.
© 2010 Pearson Education, Inc.
Concept Check
Imagine that you have planted bean seedlings (C3) and corn
seedlings (C4) in an artificial soil and sealed them in an
aquarium. The aquarium has plenty of light, nutrients, and
water but a given volume of air. Based on your knowledge of
photorespiration, which of the following is most likely?
a. Both kinds of plants should do equally well.
b. As the plants photosynthesize, the carbon dioxide
levels will fall, giving the C3 plants the advantage.
c. As the plants photosynthesize, the carbon dioxide
levels will fall, giving the C4 plants the advantage.
d. The results are unpredictable.
© 2010 Pearson Education, Inc.
Interpreting Data
Keeling, C.D. and T.P. Whorf.
2004. Atmospheric CO2
records from sites in the SIO
air sampling network. In
Trends: A Compendium of Data
on Global Change. Carbon
Dioxide Information Analysis
Center, Oak Ridge National
Laboratory, U.S. Department of
Energy, Oak Ridge, Tenn.,
U.S.A.
Mauna Loa Atmospheric Carbon Dioxide
390
380
CO2 (ppm)
370
360
350
340
330
320
310
300
1955
1965
1975
1985
1995
2005
Years
This graph shows the levels of CO2 in the atmosphere measured at
Hawaii’s Mauna Loa Observatory over the last 40+ years—the longest
measurement of its kind. Take a close look at this graph. The next slides
will have some questions for you to consider.
© 2010 Pearson Education, Inc.
Interpreting Data
Mauna Loa Atmospheric Carbon Dioxide
334
332
330
CO2 (ppm)
Here’s a magnified view
of five years of data on
CO2 levels. What do you
think is the most likely
cause for the cycles you
see in this data?
328
326
324
a. the differing amounts
of CO2 produced by
plants during
daylight and night
hours
b. volcanic emissions
c. seasonal differences
in CO2 uptake by
photosynthesizers
© 2010 Pearson Education, Inc.
322
320
1970
1971
1972
1973
Years
1974
1975
Interpreting Data
a. A.
b. B.
c. C.
d. D.
© 2010 Pearson Education, Inc.
Mauna Loa Atmospheric Carbon Dioxide
334
332
B.
330
CO2 (ppm)
Which of the following
labeled points on the
graph represent fall
carbon dioxide levels in
the Northern
Hemisphere?
328
326
C.
324
322
320
1970
D.
A.
1971
1972
1973
Years
1974
1975
Interpreting Data
a. about a 60%
increase
b. about a 20%
increase
c. about a 10%
increase
d. about a 5%
increase
© 2010 Pearson Education, Inc.
Mauna Loa Atmospheric Carbon Dioxide
390
380
370
CO2 (ppm)
The data indicate that
carbon dioxide levels are
rising. How much of an
increase is indicated in
the data over the last
40+ years?
360
350
340
330
320
310
300
1955
1965
1975
1985
Years
1995
2005
Biology and Society
This graph shows a correlation between global surface temperature and
atmospheric carbon dioxide. The temperature and carbon dioxide
increases are real—but direct correlation is difficult to prove. The United
States has not signed the international Kyoto agreement that sets
aggressive goals to reduce carbon dioxide emissions. Do you think we
should have direct evidence before taking aggressive action?
Strongly
Agree
A.
© 2010 Pearson Education, Inc.
B.
C.
D.
E.
Strongly
Disagree
Biology and Society
This graph shows a correlation between global surface temperature and
atmospheric carbon dioxide. The temperature and carbon dioxide
increases are real—but direct correlation is difficult to prove. The United
States has not signed the international Kyoto agreement that sets
aggressive goals to reduce carbon dioxide emissions. Do you think we
had better start now to curb carbon dioxide emissions?
Strongly
Agree
A.
© 2010 Pearson Education, Inc.
B.
C.
D.
E.
Strongly
Disagree
Biology and Society
This graph shows predicted carbon dioxide levels for three different
global emission plans: A, no control; B, moderate control; and C,
aggressive control. Do you think the United States should take the
lead on curbing global carbon dioxide levels?
Strongly
Agree
A.
© 2010 Pearson Education, Inc.
B.
C.
D.
E.
Strongly
Disagree