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Biology

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71. In cacti, CO2 is stored for use in the Calvin cycle
a. in the stems, roots, and leaves.
b. during the evening.
c. in glucose molecules.
d. in the stroma.
e. Both a and d

72. If global climate change continues and CO2 levels continue to rise,
a. C4 plants will be favored.
b. C3 plants will have a comparative advantage.
c. More rice and wheat should be grown.
d. Photorespiration will increase.
e. Both b and c

73. The level of atmospheric CO2 has varied considerably over the years. Currently, the level of atmospheric CO2
a. is four times what is was during the time of the dinosaurs.
b. favors C4 plants under hot conditions.
c. has resulted in maximum CO2 fixation by rubisco.
d. is decreasing.
e. prevents the occurrence of photorespiration.

74. Plants classified as CAM store CO2
a. by making oxaloacetate.
b. by making PEP carboxylase.
c. in malic acid.
d. in crassulacean acid.
e. Both a and c

75. Photosynthesis takes place in plants only in the light. Respiration takes place
a. in the dark only.
b. in the light only.
c. in all organisms except plants.
d. both with and without light.
e. None of the above

76. In plants, the reactions of glycolysis occur
a. in C3 plants only.
b. in the mitochondria.
c. in the chloroplasts.
d. only in the presence of light.
e. in the cytosol.

77. Photosynthesis and respiration are linked through the
a. Calvin cycle.
b. citric acid cycle.
c. enzyme rubisco.
d. need for light.
e. a, b, and c

78. Photosynthesis
a. uses 100 percent of the sunlight that reaches Earth.
b. is a very efficient biochemical pathway.
c. utilizes all wavelengths of light.
d. converts 90 percent of light energy to chemical energy.
e. utilizes only a small portion of the energy of sunlight.