BIOL 1120 EXAM 3 WITH CORRECT
ANSWERS 2025
Which one of the following is an adaptation by plants to life on land?
A. lack of waxy cuticle
B. Calvin cycle of photosynthesis
C.xylem tracheas and vessels
D.Krebs cycles of respiration ( correct answers ) C
Which of the following was an essential adaptive feature for the
evolution of plants from water to land?
E. minimizing the evaporative loss of water
F. using light more efficiently
G.acquiring CO2 from the air
H.acquiring water from the ground ( correct answers ) A
The architecture and distribution of the root system and production of
proteins in plants are directly relevant to the availability ______ in the
soil.
I. of carbon dioxide
J. and richness of nitrates
K. of fungal association
L. of water ( correct answers ) B
The symplast is the continuum of cytosol connected by ____.
M.extracellular spaces
N.apoplectic route
O.plasmodesmata
P. symplastic route ( correct answers ) C
Which of the following determines the direction of water movement
across the membrane?
Q.cell health
R. a difference in water potential
S. size of the cell
T. shape of the cell ( correct answers ) B
Plants do not have a circulatory system like that of some animals. If a
water molecule did "circulate" (that is, go from one point in a plant to
another and back in the same day), it would require the activity of ____.
, A. only the xylem
B. only the phloem
C.only the endodermis
D.both the xylem and ( correct answers )
phloem D
Plasmodesmata can change in number, and when dilated can provide a
passageway for ____.
A. macromolecules such as RNA and proteins
B. ribosomes
C.chloroplasts
D.mitochondria ( correct answers ) A
Typically, on average, what percentage of a plant's fresh biomass in
water?
E. 70-75
F. 65-75
G.80-90
H.75-80 ( correct answers ) C
Guard cells do which of the following?
A. protect the endodermis
B. accumulate K+ in order to close the stomata
C.contain chloroplasts that import K+ directly into the
cell ( correct answers )
D.help balance the photosynthesis-transpiration D
compromise begins to decline when leaves wilt because _____.
Photosynthesis
A. chloroplasts within wilted leaves are incapable of photosynthesis
B. CO2 accumulates in the leaves and inhibits the enzymes needed for
photosynthesis
C.there is insufficient water for photolysis during the light reactions
D.stomata close, restricting CO2 entry into the leaf ( correct answers )
D
Which of the following is an adaptation that enhances the uptake of water
and minerals by roots?
E. mycorrhizae
F. cavitation
G.active uptake by vessel elements
H.rhythmic contractions by cortical cells ( correct answers ) A
Movement of xylem sap from roots to leaves _____.
I. occurs through the apoplectic of sieve-tube elements
J. usually depends on tension, or negative pressure potential
K. depends on active transport
L. depends on the pumping of water through aquaporins ( correct
answers ) B
ANSWERS 2025
Which one of the following is an adaptation by plants to life on land?
A. lack of waxy cuticle
B. Calvin cycle of photosynthesis
C.xylem tracheas and vessels
D.Krebs cycles of respiration ( correct answers ) C
Which of the following was an essential adaptive feature for the
evolution of plants from water to land?
E. minimizing the evaporative loss of water
F. using light more efficiently
G.acquiring CO2 from the air
H.acquiring water from the ground ( correct answers ) A
The architecture and distribution of the root system and production of
proteins in plants are directly relevant to the availability ______ in the
soil.
I. of carbon dioxide
J. and richness of nitrates
K. of fungal association
L. of water ( correct answers ) B
The symplast is the continuum of cytosol connected by ____.
M.extracellular spaces
N.apoplectic route
O.plasmodesmata
P. symplastic route ( correct answers ) C
Which of the following determines the direction of water movement
across the membrane?
Q.cell health
R. a difference in water potential
S. size of the cell
T. shape of the cell ( correct answers ) B
Plants do not have a circulatory system like that of some animals. If a
water molecule did "circulate" (that is, go from one point in a plant to
another and back in the same day), it would require the activity of ____.
, A. only the xylem
B. only the phloem
C.only the endodermis
D.both the xylem and ( correct answers )
phloem D
Plasmodesmata can change in number, and when dilated can provide a
passageway for ____.
A. macromolecules such as RNA and proteins
B. ribosomes
C.chloroplasts
D.mitochondria ( correct answers ) A
Typically, on average, what percentage of a plant's fresh biomass in
water?
E. 70-75
F. 65-75
G.80-90
H.75-80 ( correct answers ) C
Guard cells do which of the following?
A. protect the endodermis
B. accumulate K+ in order to close the stomata
C.contain chloroplasts that import K+ directly into the
cell ( correct answers )
D.help balance the photosynthesis-transpiration D
compromise begins to decline when leaves wilt because _____.
Photosynthesis
A. chloroplasts within wilted leaves are incapable of photosynthesis
B. CO2 accumulates in the leaves and inhibits the enzymes needed for
photosynthesis
C.there is insufficient water for photolysis during the light reactions
D.stomata close, restricting CO2 entry into the leaf ( correct answers )
D
Which of the following is an adaptation that enhances the uptake of water
and minerals by roots?
E. mycorrhizae
F. cavitation
G.active uptake by vessel elements
H.rhythmic contractions by cortical cells ( correct answers ) A
Movement of xylem sap from roots to leaves _____.
I. occurs through the apoplectic of sieve-tube elements
J. usually depends on tension, or negative pressure potential
K. depends on active transport
L. depends on the pumping of water through aquaporins ( correct
answers ) B
