BIO 120 Chapter 10 Exam Questions and Answers Already Passed Latest 2025-2026
Cellular respiration is the process by which sugars are used to generate adenosine triphosphate (ATP)
and carbon dioxide, whereas photosynthesis uses ATP and carbon dioxide to make sugars. In
photosynthesis, which of the following statements would be correct? - Answers Water loses electrons
and is oxidized.
Which of the following organisms would be considered an autotroph? - Answers Corn
What color will a pigment appear to be if the pigments absorb all the wavelengths of the visible
spectrum? - Answers Black
Which of the following best describes the process of fluorescence? - Answers Fluorescence is the release
of light when an excited electron falls back down to its ground state.
The equation 6 CO2 + 6 H2O + light energy → C6 H12 O6 (glucose) + 6 O2 represents which of the
following processes? - Answers Photosynthesis
This figure shows the absorption spectra of individual photosynthetic pigments compared to the overall
action spectrum for photosynthesis. Why are they different? - Answers Individual photosynthetic
pigments absorb specific wavelengths of light and reflect others. The action spectrum for photosynthesis
represents how all the pigments work together in an intact leaf.
An organism that must obtain food, including sugars and other macromolecules, from other organisms is
called a __________. - Answers heterotroph
To make one glucose molecule with six turns of the Calvin cycle, 18 adenosine triphosphate (ATP) and 12
NADPH molecules are needed. But during the light capturing reactions, equal amounts of ATP and
nicotinamide adenine dinucleotide phosphate (NADPH) are produced. How do plants deal with this
imbalance? - Answers During photosynthesis, some of the light capturing reactions can switch from
noncyclic to cyclic electron flow, producing more ATP than NADPH.
Between 1945 and 1955, a team led by Melvin Calvin began introducing radioactively labeled carbon
dioxide (14CO2) to algae performing photosynthesis and identified the molecules that subsequently
became labeled with the radioisotope.
Calvin found that the molecules labeled with 14C __________. - Answers were 3-phosphoglycerate and
many other intermediates in the formation of glucose
Electromagnetic energy in the form of light is permanently converted to chemical energy when
__________. - Answers an electron acceptor accepts the energy and becomes reduced
, Fluorescence is always accompanied by the release of heat. Thus, the energy in the form of light that is
released as fluorescence is always __________. - Answers of lower energy than the photon of energy
absorbed
Carotenoids are thought to protect leaves from damage. Which of the following accounts for that
protection? - Answers Carotenoids absorb the high-energy, short-wavelength light that can generate
free radicals in plant cells.
The enhancement effect observed in which more oxygen is produced in the presence of two different
wavelengths of light at the same time than when the discrete amounts of oxygen produced separately
by each wavelength of light are combined suggests __________. - Answers that the rate of
photosynthesis for red and far-red light is more efficient when they are present together than when
they are separate
How do CAM plants differ from C3 plants? - Answers CAM plants open their stomata at night and store
carbon dioxide (CO2) in the form of organic acids.
Which of the following wavelengths represents the visible portion of the electromagnetic spectrum? -
Answers 400 nm to 710 nm
What is noncyclic electron flow? - Answers The passage of electrons from water to NADP+
The transport of carbon dioxide (CO2) into plant cells is regulated by stomata. What additional cells help
regulate this transport? - Answers Guard cells
The reduction of which of the following molecules is responsible for the transformation of light energy
into chemical energy? - Answers Pheophytin
If researchers could replicate the splitting of water in the laboratory, great amounts of oxygen (O2) and
hydrogen (H)2 could be made. It is obvious what O2 can be used for. H2 can be used __________. -
Answers as a clean, inexpensive replacement for gasoline
In the morning when the sun rises, the pH of the chloroplast stroma will __________, whereas the pH of
the thylakoid lumen will __________. - Answers increase; decrease
During photosynthesis, G3P from the Calvin cycle is used to produce the monosaccharide
____________. Some of these are converted into the monosaccharide ____________. The two
monosaccharides are joined together to form the disaccharide ___________ that is transported out of
the leaves to other parts of the plant. When photosynthesis is happening rapidly, there is not enough
transport out of the cells. So the sugars are stored temporarily in the leaves as the polymer _________.
At night, the polymers can be broken down and transported out of the leaves. - Answers glucose;
fructose; sucrose; starch
Cellular respiration is the process by which sugars are used to generate adenosine triphosphate (ATP)
and carbon dioxide, whereas photosynthesis uses ATP and carbon dioxide to make sugars. In
photosynthesis, which of the following statements would be correct? - Answers Water loses electrons
and is oxidized.
Which of the following organisms would be considered an autotroph? - Answers Corn
What color will a pigment appear to be if the pigments absorb all the wavelengths of the visible
spectrum? - Answers Black
Which of the following best describes the process of fluorescence? - Answers Fluorescence is the release
of light when an excited electron falls back down to its ground state.
The equation 6 CO2 + 6 H2O + light energy → C6 H12 O6 (glucose) + 6 O2 represents which of the
following processes? - Answers Photosynthesis
This figure shows the absorption spectra of individual photosynthetic pigments compared to the overall
action spectrum for photosynthesis. Why are they different? - Answers Individual photosynthetic
pigments absorb specific wavelengths of light and reflect others. The action spectrum for photosynthesis
represents how all the pigments work together in an intact leaf.
An organism that must obtain food, including sugars and other macromolecules, from other organisms is
called a __________. - Answers heterotroph
To make one glucose molecule with six turns of the Calvin cycle, 18 adenosine triphosphate (ATP) and 12
NADPH molecules are needed. But during the light capturing reactions, equal amounts of ATP and
nicotinamide adenine dinucleotide phosphate (NADPH) are produced. How do plants deal with this
imbalance? - Answers During photosynthesis, some of the light capturing reactions can switch from
noncyclic to cyclic electron flow, producing more ATP than NADPH.
Between 1945 and 1955, a team led by Melvin Calvin began introducing radioactively labeled carbon
dioxide (14CO2) to algae performing photosynthesis and identified the molecules that subsequently
became labeled with the radioisotope.
Calvin found that the molecules labeled with 14C __________. - Answers were 3-phosphoglycerate and
many other intermediates in the formation of glucose
Electromagnetic energy in the form of light is permanently converted to chemical energy when
__________. - Answers an electron acceptor accepts the energy and becomes reduced
, Fluorescence is always accompanied by the release of heat. Thus, the energy in the form of light that is
released as fluorescence is always __________. - Answers of lower energy than the photon of energy
absorbed
Carotenoids are thought to protect leaves from damage. Which of the following accounts for that
protection? - Answers Carotenoids absorb the high-energy, short-wavelength light that can generate
free radicals in plant cells.
The enhancement effect observed in which more oxygen is produced in the presence of two different
wavelengths of light at the same time than when the discrete amounts of oxygen produced separately
by each wavelength of light are combined suggests __________. - Answers that the rate of
photosynthesis for red and far-red light is more efficient when they are present together than when
they are separate
How do CAM plants differ from C3 plants? - Answers CAM plants open their stomata at night and store
carbon dioxide (CO2) in the form of organic acids.
Which of the following wavelengths represents the visible portion of the electromagnetic spectrum? -
Answers 400 nm to 710 nm
What is noncyclic electron flow? - Answers The passage of electrons from water to NADP+
The transport of carbon dioxide (CO2) into plant cells is regulated by stomata. What additional cells help
regulate this transport? - Answers Guard cells
The reduction of which of the following molecules is responsible for the transformation of light energy
into chemical energy? - Answers Pheophytin
If researchers could replicate the splitting of water in the laboratory, great amounts of oxygen (O2) and
hydrogen (H)2 could be made. It is obvious what O2 can be used for. H2 can be used __________. -
Answers as a clean, inexpensive replacement for gasoline
In the morning when the sun rises, the pH of the chloroplast stroma will __________, whereas the pH of
the thylakoid lumen will __________. - Answers increase; decrease
During photosynthesis, G3P from the Calvin cycle is used to produce the monosaccharide
____________. Some of these are converted into the monosaccharide ____________. The two
monosaccharides are joined together to form the disaccharide ___________ that is transported out of
the leaves to other parts of the plant. When photosynthesis is happening rapidly, there is not enough
transport out of the cells. So the sugars are stored temporarily in the leaves as the polymer _________.
At night, the polymers can be broken down and transported out of the leaves. - Answers glucose;
fructose; sucrose; starch
