Question 1

Bulk flow in the phloem tissue is mostly downward whereas bulk flow in xylem is mostly:

Accepted Answer

A)  sideways.
B)  also downward.
C)  very little bulk flow occurs in xylem.
D)  flow of sugars.
E)  upward.F) A) and E)
G) None of the above

Question 2

Mutant plants that wilt easily under strong sunlight and high temperatures have been isolated.The stomata in these plants are functional,but do not respond to ABA.What protein may be missing from these plants?

Accepted Answer

A)  Aquaporin
B)  ABA receptor
C)  H+-ATPase proton pump
D)  P proteinsE) A) and B)
F) A) and C)

Question 3

FITC-boronic acid is a dye that stains cell walls and intracellular spaces.This dye is probably transported via:

Accepted Answer

A)  transmembrane transport.
B)  symplastic transport.
C)  apoplastic transport.
D)  transpiration.E) None of the above
F) A) and D)

Question 4

Transpiration water loss occurs mostly through which of the following structures?

Accepted Answer

A)  Pores
B)  Stomata
C)  Epidermal cells
D)  Guard cells
E)  VesselsF) All of the above
G) A) and B)

Question 5

Which cells are likely to have a higher cellular water potential?

Accepted Answer

A)  Sieve-tube elements near source tissues
B)  Sieve-tube elements near sink tissuesC) A) and B)
D) undefined

Question 6

How do you think global warming is affecting leaf abscission?

Accepted Answer

A)  No change.
B)  Leaf abscission is happening earlier in the fall.
C)  Leaf abscission is happening later in the fall.
D)  Leaf abscission occurs continually.E) All of the above
F) A) and B)

Question 7

A turgid cell that you are studying has a solute potential of -1.3MPa.What is its approximate water potential?

Accepted Answer

A)  1.3
B)  0.3
C)  -2.3
D)  -0.3
E)  -1.3F) A) and D)
G) None of the above

Question 8

Which activity may be helpful in reducing dependency on inorganic fertilizers?

Accepted Answer

A)  Nitrogen fixation
B)  Composting
C)  Weathering
D)  Chlorosis
E)  LeachingF) A) and D)
G) B) and E)

Question 9

Which one of the following is the best explanation for why plants may use active rather than passive transport?

Accepted Answer

A)  The phospholipid bilayer is not formed.
B)  Protein channels are plugged.
C)  Development of pores has not occurred.
D)  Membrane potential is blockeD.
E)  Solute concentration is a factor.F) C) and D)
G) A) and C)

Question 10

Arabidopsis plants that have mutant AtSUC2 alleles accumulate sugar and starch in their mature leaves.What process might these plants be unable to carry out?

Accepted Answer

A)  Abscission
B)  Phloem loading
C)  Guttation
D)  PhotosynthesisE) B) and C)
F) A) and D)

Question 11

Which one of the following is NOT considered to be one of the macronutrients needed by plants?

Accepted Answer

A)  manganese
B)  sulfur
C)  phosphorus
D)  nitrogen
E)  potassiumF) All of the above
G) B) and C)

Question 12

Why is it particularly important for the endodermis to block transport in the specific location where it does?

Accepted Answer

A)  to control access of transported materials to the plant vascular tissues,which can carry materials throughout the plant.
B)  to prevent materials from encountering the Casparian strip.
C)  to prevent harmful materials from entering the cortex.
D)  to prevent all symplastic transport.E) A) and D)
F) C) and D)

Question 13

One feature that phloem cells have that xylem cells lack is:

Accepted Answer

A)  water potential.
B)  cell walls.
C)  plasmodesmata.
D)  membranes.
E)  cytosol.F) A) and C)
G) A) and B)

Question 14

Which of the following produce organic acids that may contribute to weathering of rocks?

Accepted Answer

A)  Arctic plants
B)  Water plants
C)  Aerial plants
D)  Lichens
E)  MossesF) A) and C)
G) A) and D)

Question 15

A turgid plant cell is one that:

Accepted Answer

A)  lacks a cell wall.
B)  has an extra cell wall layer.
C)  lacks cytosol.
D)  has excess water in its cytosol.
E)  may be described as flaccid.F) A) and B)
G) All of the above

Question 16

Active transport occurs ________ the concentration gradient across a cell membrane.

Accepted Answer

A)  against
B)  towards
C)  away from
D)  in between
E)  passively againstF) B) and C)
G) A) and B)

Question 17

You find a sick plant in an arid environment.After studying it,you believe it is specifically defective in C4 photosynthesis.What nutrient might this plant be lacking?

Accepted Answer

A)  Copper
B)  Nickel
C)  Molybdenum
D)  Sulfur
E)  SodiumF) None of the above
G) B) and E)

Question 18

Arabidopsis irx4 mutants have a collapsed xylem phenotype.What process is likely to be defective in these mutants?

Accepted Answer

A)  Bulk flow
B)  Guttation
C)  Stomatal opening
D)  Deposit of ligninE) A) and B)
F) None of the above

Question 19

When guard cells are ________ a stomatal pore opens between them.

Accepted Answer

A)  flaccid
B)  overextended
C)  turgid
D)  solute depleted
E)  ionically chargedF) B) and C)
G) A) and B)

Question 20

Channels in membranes are best described as:

Accepted Answer

A)  open spaces.
B)  closed spaces.
C)  protein plugs.
D)  molecule catchers.
E)  pores for air exchangE.F) A) and E)
G) None of the above

Exam 29: Flowering Plants: Nutrition and Transport

Bulk flow in the phloem tissue is mostly downward whereas bulk flow in xylem is mostly:

Correct AnswerverifiedShow Answer

Why is it particularly important for the endodermis to block transport in the specific location where it does?

Correct AnswerverifiedShow Answer

Active transport occurs ________ the concentration gradient across a cell membrane.

Correct AnswerverifiedShow Answer

Which of the following produce organic acids that may contribute to weathering of rocks?

Correct AnswerverifiedShow Answer

Mutant plants that wilt easily under strong sunlight and high temperatures have been isolated.The stomata in these plants are functional,but do not respond to ABA.What protein may be missing from these plants?

Correct AnswerverifiedShow Answer

Which activity may be helpful in reducing dependency on inorganic fertilizers?

Correct AnswerverifiedShow Answer

How do you think global warming is affecting leaf abscission?

Correct AnswerverifiedShow Answer

Arabidopsis irx4 mutants have a collapsed xylem phenotype.What process is likely to be defective in these mutants?

Correct AnswerverifiedShow Answer

You find a sick plant in an arid environment.After studying it,you believe it is specifically defective in C4 photosynthesis.What nutrient might this plant be lacking?

Correct AnswerverifiedShow Answer

FITC-boronic acid is a dye that stains cell walls and intracellular spaces.This dye is probably transported via:

Correct AnswerverifiedShow Answer

Which one of the following is the best explanation for why plants may use active rather than passive transport?

Correct AnswerverifiedShow Answer

When guard cells are ________ a stomatal pore opens between them.

Correct AnswerverifiedShow Answer

Arabidopsis plants that have mutant AtSUC2 alleles accumulate sugar and starch in their mature leaves.What process might these plants be unable to carry out?

Correct AnswerverifiedShow Answer

A turgid plant cell is one that:

Correct AnswerverifiedShow Answer

Which cells are likely to have a higher cellular water potential?

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Channels in membranes are best described as:

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One feature that phloem cells have that xylem cells lack is:

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Which one of the following is NOT considered to be one of the macronutrients needed by plants?

Correct AnswerverifiedShow Answer

Transpiration water loss occurs mostly through which of the following structures?

Correct AnswerverifiedShow Answer

A turgid cell that you are studying has a solute potential of -1.3MPa.What is its approximate water potential?

Correct AnswerverifiedShow Answer

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You find a sick plant in an arid environment.After studying it,you believe it is specifically defective in C₄ photosynthesis.What nutrient might this plant be lacking?

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