Question 1

One example of a reduced form of a nutrient is the _______ in _______.

Accepted Answer

A)   carbon;CO2
B)   hydrogen;water
C)   phosphorus;phosphate
D)   nitrogen;ammonia
E)   sulfur;sulfate

Question 2

Cell walls impregnated with water-repellent suberin are found in the cells of

Accepted Answer

A)   root hairs.
B)   the cortex.
C)   tracheids.
D)   the pericycle.
E)   the endodermis.

Question 3

One of the defining characteristics of an essential element is that it

Accepted Answer

A)   is necessary only for early growth of the seedling in plants.
B)   can be replaced by another element.
C)   is usually necessary for a plant's survival.
D)   functions by relieving the toxicity of another element.
E)   is found in relatively high concentrations in the environment.

Question 4

Cells in the leaf release abscisic acid in response to

Accepted Answer

A)   an excessively negative water potential.
B)   a reduction in CO2.
C)   the reduction in light at night.
D)   an increase of Cl- in the guard cells.
E)   an increase in K+ in the guard cells.

Question 5

Which statement about aquaporins is true?

Accepted Answer

A)   They are necessary to protect cells from toxins.
B)   They are directly involved in mineral transport.
C)   They facilitate water flow through cell membranes.
D)   They prevent too much water from traveling between cells.
E)   They contain transport proteins.

Question 6

Which is not essential to the process of biological nitrogen fixation in soybean (legume) nodules?

Accepted Answer

A)   N2 gas
B)   O2 gas
C)   A strong reducing agent
D)   A great deal of energy
E)   The enzyme nitrogenase

Question 7

Which of the following represents,in correct order,the steps taken by a sucrose molecule as it travels in the phloem?

Accepted Answer

A)   Source companion cell  →\rightarrow→   phloem  →\rightarrow→   sink companion cell  →\rightarrow→   sink  →\rightarrow→   mesophyll
B)   Mesophyll  →\rightarrow→  phloem  →\rightarrow→  sink companion cell  →\rightarrow→   sink →\rightarrow→  source companion cell
C)   Mesophyll  →\rightarrow→   source companion cell  →\rightarrow→   phloem  →\rightarrow→  sink companion cell →\rightarrow→  sink
D)   Phloem  →\rightarrow→  sink companion cell  →\rightarrow→   sink  →\rightarrow→   mesophyll →\rightarrow→  source companion cell
E)   Sink companion cell  →\rightarrow→   sink  →\rightarrow→  mesophyll  →\rightarrow→   source companion cell  →\rightarrow→   phloem

Question 8

Which statement about the movement of potassium ions during stomatal opening is true?

Accepted Answer

A)   K+ enters guard cells,water follows,and the cells become turgid.
B)   K+ leaves guard cells and they become less turgid.
C)   K+ enters guard cells and they become less turgid.
D)   K+ leaves guard cells and they become turgid.
E)   K+ reaches equilibrium in guard cells and their surroundings.

Question 9

Which statement about proton pumping across the cell membrane of plants is false?

Accepted Answer

A)   It requires ATP.
B)   The region inside the membrane becomes positively charged with respect to the region outside.
C)   It enhances the movement of K+ ions into the cell.
D)   It pushes protons out of the cell against a proton concentration gradient.
E)   It can drive the secondary active transport of negatively charged ions.

Question 10

When sugars are actively transported out of the sink end of a sieve tube,water

Accepted Answer

A)   flows back into the xylem,also by active transport.
B)   flows back into the xylem by facilitated diffusion.
C)   flows back into the xylem by osmosis.
D)   passively follows the sugars.
E)   is actively transported out of the sink end along with the sugars.

Question 11

A semi-fossilized sample of plant tissue from an archaeological site contains long tubes of connected cells with secondary cell walls.They show signs of having been dead before the overall death of the plant from which they came.These are probably

Accepted Answer

A)   companion cells.
B)   sieve tubes.
C)   phloem members.
D)   pericycle cells.
E)   xylem vessels.

Question 12

A botanist is curious about the contents of the phloem in a newly discovered relative of limes.The best way to obtain this information would be to

Accepted Answer

A)   use tiny drills and capillary pipettes.
B)   collect material from stylets of aphids that are infecting the tree.
C)   obtain liquids oozing from cut lime stem surfaces.
D)   collect droplets formed by guttation.
E)   gather the tree's mycorrhizal fungi for subsequent analysis.

Question 13

If you were going to try to get non-legumes to nodulate for the nutritional benefit of the plants,which part of the plants would you work on modifying?

Accepted Answer

A)   Roots
B)   Stems
C)   Leaves
D)   Flowers
E)   Petioles

Question 14

The plant cells that lose large amounts of water most directly and thus generate the low water potential that pulls water up from the roots are the _______ cells.

Accepted Answer

A)   mesophyll
B)   guard
C)   root hair
D)   epidermal
E)   xylem

Question 15

Which three elements are most commonly added to agricultural soils as fertilizers?

Accepted Answer

A)   Nitrogen,phosphorus,and iron
B)   Nitrogen,potassium,and magnesium
C)   Potassium,sulfur,and iron
D)   Nitrogen,potassium,and phosphorus
E)   Nitrogen,sulfur,and calcium

Question 16

Nodules that are actively fixing nitrogen are pink,demonstrating the presence of

Accepted Answer

A)   nitrogen.
B)   chlorophyll.
C)   leghemoglobin.
D)   nitrogenase.
E)   CO2.

Question 17

According to the pressure flow model,during fruit development,photosynthesizing leaves are the carbohydrate _______ and the fruit are the _______.

Accepted Answer

A)   sinks;sinks
B)   sinks;sources
C)   sources;source
D)   sources;sinks
E)   sources;sources or sinks

Question 18

The enzyme nitrogenase

Accepted Answer

A)   allows normally unavailable atmospheric nitrogen to be reduced to available ammonia.
B)   is responsible for oxidizing atmospheric nitrogen.
C)   attacks the double bond in atmospheric nitrogen gas.
D)   is naturally found in most plants.
E)   allows plants to access atmospheric nitrogen directly.

Question 19

When sugars are actively transported into the source end of a sieve tube,turgor pressure at that end

Accepted Answer

A)   does not change,because sugar concentration has no effect on turgor pressure.
B)   increases,because sugar concentration directly affects turgor pressure.
C)   increases because water enters,creating a pressure gradient along the sieve tube.
D)   decreases,because water exits.
E)   decreases,because sugar concentration directly affects turgor pressure.

Question 20

One advantage to using inorganic fertilizers (as opposed to organic fertilizers) is that

Accepted Answer

A)   they improve the physical properties of the soil.
B)   they can be taken up almost instantaneously.
C)   their quality is better than that of organic fertilizers.
D)   they contain minerals in their proper ionic form.
E)   None of the above

Exam 25: Plant Nutrition and Transport

Cells in the leaf release abscisic acid in response to

Correct AnswerverifiedShow Answer

Cell walls impregnated with water-repellent suberin are found in the cells of

Correct AnswerverifiedShow Answer

The plant cells that lose large amounts of water most directly and thus generate the low water potential that pulls water up from the roots are the _______ cells.

Correct AnswerverifiedShow Answer

One advantage to using inorganic fertilizers (as opposed to organic fertilizers) is that

Correct AnswerverifiedShow Answer

A semi-fossilized sample of plant tissue from an archaeological site contains long tubes of connected cells with secondary cell walls.They show signs of having been dead before the overall death of the plant from which they came.These are probably

Correct AnswerverifiedShow Answer

Nodules that are actively fixing nitrogen are pink,demonstrating the presence of

Correct AnswerverifiedShow Answer

The enzyme nitrogenase

Correct AnswerverifiedShow Answer

Which statement about aquaporins is true?

Correct AnswerverifiedShow Answer

Which is not essential to the process of biological nitrogen fixation in soybean (legume) nodules?

Correct AnswerverifiedShow Answer

Which statement about the movement of potassium ions during stomatal opening is true?

Correct AnswerverifiedShow Answer

When sugars are actively transported out of the sink end of a sieve tube,water

Correct AnswerverifiedShow Answer

One example of a reduced form of a nutrient is the _______ in _______.

Correct AnswerverifiedShow Answer

If you were going to try to get non-legumes to nodulate for the nutritional benefit of the plants,which part of the plants would you work on modifying?

Correct AnswerverifiedShow Answer

Which of the following represents,in correct order,the steps taken by a sucrose molecule as it travels in the phloem?

Correct AnswerverifiedShow Answer

A botanist is curious about the contents of the phloem in a newly discovered relative of limes.The best way to obtain this information would be to

Correct AnswerverifiedShow Answer

One of the defining characteristics of an essential element is that it

Correct AnswerverifiedShow Answer

When sugars are actively transported into the source end of a sieve tube,turgor pressure at that end

Correct AnswerverifiedShow Answer

Which three elements are most commonly added to agricultural soils as fertilizers?

Correct AnswerverifiedShow Answer

Which statement about proton pumping across the cell membrane of plants is false?

Correct AnswerverifiedShow Answer

According to the pressure flow model,during fruit development,photosynthesizing leaves are the carbohydrate _______ and the fruit are the _______.

Correct AnswerverifiedShow Answer

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One example of a reduced form of a nutrient is the _ in _.

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According to the pressure flow model,during fruit development,photosynthesizing leaves are the carbohydrate _ and the fruit are the _.

Correct Answer
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