Final Exam Bio 117 Guardiola
questions with complete solutions
x= hypotonic
y= equal and opposite to in value - correct answer ✔✔ A plant cell is placed in a(n) [x] solution.
This causes the plant cell to fill with water until the solute potential is [y] the pressure potential.
Zone of cellular elongation and zone of cellular division - correct answer ✔✔ Which part of a
root are actively pushed through soil as the root grows?
prevent water loss
absorption of water and nutrients
anchorage
carbohydrate storage - correct answer ✔✔ Which of the following are functions of the root
system?
It allows water to continue to move up the xylem by adhesion and cohesion. and
It prevents the formation of an air bubble in the xylem because transpiration continues to pull
water up the xylem. - correct answer ✔✔ My aunt makes floral arrangements from cut flowers
from her yard. After cutting the flowers, she then brings them inside and cuts off a bit of the
end of the stem under running water. Which of the following BEST explain how doing this helps
the flowers last longer.
passive, active, decreases - correct answer ✔✔ The transport of water into roots is [x] because
the [y] transport of minerals and ions into roots [z] the water potential of roots as compared to
the water potential of the surrounding soil.
,a tissue where sugar enters the phloem and
a tissue that either produces sugar by photosynthesis or by breaking down stored starge -
correct answer ✔✔ In a plant cells that are sources of sugar are
Pressure potential but not solute potential affect the water potential in the xylem because
xylem cells lack a cell membrane at maturity - correct answer ✔✔ Which of the following BEST
explains why water moves up xylem tissue by bulk flow?
Water and sucrose flow up the stems. - correct answer ✔✔ According to the pressure-flow
hypothesis, which direction are sucrose and water following in the phloem when roots are the
sources and leaves are sinks?
Near leaves at the start of spring - correct answer ✔✔ According to the pressure-flow
hypothesis, water moves into the phloem from the xylem due to a water potential gradient.
Water also moves out of the phloem back to the xylem due to a water potential gradient. The
water potential of phloem sap is lowest in which of the following situations?
cohesive and adhesive forces of the water column under evaporative tension - correct answer
✔✔ The transport of a water column up a tall tree can be explained by....
Place the auxin on the east side of their stem. - correct answer ✔✔ Using purified auxin,how
would you manipulate a bed of tulips to have stems that bend to the west? (The figure below
shows a bed of red and yellow tulips.)
1. Phototropins in the shoot tip absorb blue light.
2. Auxin is released asymmetrically at the tip of the shoot.
3. Auxin binds to an auxin receptor.
4. Proton pump activity increases in the cell membrane.
5. The cell wall becomes more acidic.
6. Proteins called expansins are activated.
, 7.Rigidity of the cell wall breaks down (specifically, connections between cellulose microfibrils
are loosened)
8. Water enters the cell. Turgor increases and expands the cell - correct answer ✔✔ The first
and last events of the phototropic response are shown below. Order the sequence of events to
describe information processing and signal transduction in the phototropic response.
FIRST event: Plant shoot is exposed to blue light on one side but not the other.
LAST event: Plant shoot grows unequally bending toward the light.
auxin, apical dominance, the apical meritstem - correct answer ✔✔ In a plant that has the top
of its shoot present, the hormone [x] is responsible for [y], which means the majority of the
stem growth occurs at [z].
Phototropins, blue, phosphorylation, conformation - correct answer ✔✔ In a plant that is
growing toward directed light, there are sensing cells in shoot tips with receptors called [w] that
detect [x] light. These receptors are activated by [y], which causes a change in [z].
true - correct answer ✔✔ True or False? A phytochrome in the Pfr conformation has recently
been exposed to red light (~660nm).
Abscisic Acid - correct answer ✔✔ Which of the following plant hormones is described below?
Inhibits growth; allows plants to tolerate stresses
Ethylene - correct answer ✔✔ Which of the following plant hormones is described below?
A gaseous hormone; quickens leaf abscission
questions with complete solutions
x= hypotonic
y= equal and opposite to in value - correct answer ✔✔ A plant cell is placed in a(n) [x] solution.
This causes the plant cell to fill with water until the solute potential is [y] the pressure potential.
Zone of cellular elongation and zone of cellular division - correct answer ✔✔ Which part of a
root are actively pushed through soil as the root grows?
prevent water loss
absorption of water and nutrients
anchorage
carbohydrate storage - correct answer ✔✔ Which of the following are functions of the root
system?
It allows water to continue to move up the xylem by adhesion and cohesion. and
It prevents the formation of an air bubble in the xylem because transpiration continues to pull
water up the xylem. - correct answer ✔✔ My aunt makes floral arrangements from cut flowers
from her yard. After cutting the flowers, she then brings them inside and cuts off a bit of the
end of the stem under running water. Which of the following BEST explain how doing this helps
the flowers last longer.
passive, active, decreases - correct answer ✔✔ The transport of water into roots is [x] because
the [y] transport of minerals and ions into roots [z] the water potential of roots as compared to
the water potential of the surrounding soil.
,a tissue where sugar enters the phloem and
a tissue that either produces sugar by photosynthesis or by breaking down stored starge -
correct answer ✔✔ In a plant cells that are sources of sugar are
Pressure potential but not solute potential affect the water potential in the xylem because
xylem cells lack a cell membrane at maturity - correct answer ✔✔ Which of the following BEST
explains why water moves up xylem tissue by bulk flow?
Water and sucrose flow up the stems. - correct answer ✔✔ According to the pressure-flow
hypothesis, which direction are sucrose and water following in the phloem when roots are the
sources and leaves are sinks?
Near leaves at the start of spring - correct answer ✔✔ According to the pressure-flow
hypothesis, water moves into the phloem from the xylem due to a water potential gradient.
Water also moves out of the phloem back to the xylem due to a water potential gradient. The
water potential of phloem sap is lowest in which of the following situations?
cohesive and adhesive forces of the water column under evaporative tension - correct answer
✔✔ The transport of a water column up a tall tree can be explained by....
Place the auxin on the east side of their stem. - correct answer ✔✔ Using purified auxin,how
would you manipulate a bed of tulips to have stems that bend to the west? (The figure below
shows a bed of red and yellow tulips.)
1. Phototropins in the shoot tip absorb blue light.
2. Auxin is released asymmetrically at the tip of the shoot.
3. Auxin binds to an auxin receptor.
4. Proton pump activity increases in the cell membrane.
5. The cell wall becomes more acidic.
6. Proteins called expansins are activated.
, 7.Rigidity of the cell wall breaks down (specifically, connections between cellulose microfibrils
are loosened)
8. Water enters the cell. Turgor increases and expands the cell - correct answer ✔✔ The first
and last events of the phototropic response are shown below. Order the sequence of events to
describe information processing and signal transduction in the phototropic response.
FIRST event: Plant shoot is exposed to blue light on one side but not the other.
LAST event: Plant shoot grows unequally bending toward the light.
auxin, apical dominance, the apical meritstem - correct answer ✔✔ In a plant that has the top
of its shoot present, the hormone [x] is responsible for [y], which means the majority of the
stem growth occurs at [z].
Phototropins, blue, phosphorylation, conformation - correct answer ✔✔ In a plant that is
growing toward directed light, there are sensing cells in shoot tips with receptors called [w] that
detect [x] light. These receptors are activated by [y], which causes a change in [z].
true - correct answer ✔✔ True or False? A phytochrome in the Pfr conformation has recently
been exposed to red light (~660nm).
Abscisic Acid - correct answer ✔✔ Which of the following plant hormones is described below?
Inhibits growth; allows plants to tolerate stresses
Ethylene - correct answer ✔✔ Which of the following plant hormones is described below?
A gaseous hormone; quickens leaf abscission
