Question 1

Figure 35-1  In the accompanying figure, the structure labeled as 3 is:

Accepted Answer

A)   the secondary xylem.
B)   formed by the division of the vascular cambium.
C)   found adjacent to the pith.
D)   usually referred to as wood.
E)   the cork cambium.

Question 2

Which of the following statements about the cortex is true?

Accepted Answer

A)   It secretes a protective layer of cutin.
B)   It is at the core of the herbaceous eudicot stem.
C)   It is filled with cork cells.
D)   It translocates sugar by means of a pressure gradient.
E)   It may contain collenchyma and sclerenchyma.

Question 3

Figure 35-2  In the accompanying figure, the structure responsible for photosynthesis, storage, and support is labeled as:

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5

Question 4

Dissolved sugars are transported in:

Accepted Answer

A)   cork cambium.
B)   epidermis.
C)   pith.
D)   phloem.
E)   xylem. D

Question 5

Xylem transports water and dissolved nutrient minerals in which direction?

Accepted Answer

A)   upward
B)   downward
C)   inward laterally
D)   outward laterally
E)   both upward and downward A

Question 6

Water moves from a region of ____ water potential to a region of ____water potential.

Accepted Answer

A)   more positive; less positive
B)   less positive; more positive
C)   less negative; more negative
D)   more negative; less negative
E)   more negative; zero

Question 7

According to the pressure-flow model, ____.

Accepted Answer

A)   water moves from an area of positive water potential to an area of negative water potential
B)   the evaporative pull of transpiration produces tension at the top of the plant
C)   the flow of sugar is driven by a pressure gradient between the source and the sink
D)   pressure is created by the movement of water into the roots from the soil
E)   the production of sugar pushes it out of the chloroplast and into the xylem

Question 8

If you were to take a cross section of a tree from the tropics, would you be able to determine the accurate age of the tree? Why or why not?

Accepted Answer

Concepts to Consider: No. Annual rings c...

Question 9

Sugar is translocated in phloem from a source, or an area of ____, to a sink, or an area of ____.

Accepted Answer

A)   low sugar concentration; high sugar concentration
B)   high sugar concentration; low sugar concentration
C)   positive water potential; negative water potential
D)   negative water potential; positive water potential
E)   low pressure; equally low pressure

Question 10

Using severed aphid mouthparts, scientists have verified that in most species the phloem translocates mostly ____, but that ____ may also be translocated.

Accepted Answer

A)   glucose; amino acids
B)   glucose; sugar alcohols
C)   glucose; cellulose and starch
D)   sucrose; raffinose and sorbitol
E)   sucrose; glucose

Question 11

Sugars are loaded into sieve tubes via simple diffusion .

Accepted Answer

A) True 
 B)False  False

Question 12

Cells produced on the inside of the vascular cambium differentiate to form which vascular tissue?

Accepted Answer

A)   cork cambium
B)   primary phloem
C)   primary xylem
D)   secondary phloem
E)   secondary xylem

Question 13

Which of the following is a function of stems?

Accepted Answer

A)   sexually reproduce
B)   absorb nutrient minerals
C)   produce new tissues
D)   transport dissolved gases
E)   anchor plants

Question 14

Lenticels function to:

Accepted Answer

A)   protect undeveloped embryonic shoots.
B)   permit gas exchange through the periderm.
C)   support leaves and flowers.
D)   absorb water and dissolved nutrient minerals.
E)   anchor a plant in the ground.

Question 15

____ is when liquid water is forced out of the surface of leaves.

Accepted Answer

A)   Root pressure
B)   Transpiration
C)   Guttation
D)   Hydration
E)   Translocation

Question 16

How is it possible for water to defy gravity and travel from the roots to the tops of plants? Use the tension-cohesion model to explain your answer.

Accepted Answer

Concepts to Consider: Evaporative pull o...

Question 17

Which of the following statements about monocots is true?

Accepted Answer

A)   They lack sclerenchyma tissue.
B)   They have a well-developed vascular cambium.
C)   They do not produce bark.
D)   Their lateral meristems give rise to wood.
E)   Secondary growth occurs rather slowly.

Question 18

The transport of xylem sap is the most rapid movement of any material in plants.

Accepted Answer

A) True 
 B)False

Question 19

The loading of dissolved sugars into the sieve tube elements of phloem is:

Accepted Answer

A)   passive transport.
B)   active transport.
C)   osmosis.
D)   simple diffusion.
E)   facilitated diffusion.

Question 20

Which of the following statements about heartwood is false ?

Accepted Answer

A)   It functions in conduction.
B)   It is a storage site for waste products.
C)   It is resistant to decay.
D)   It provides structural support.
E)   It is located in the center of a tree.

Exam 35: Stem Structure and Transport

Figure 35-1 In the accompanying figure, the structure labeled as 3 is:

Correct AnswerverifiedShow Answer

Which of the following statements about the cortex is true?

Correct AnswerverifiedShow Answer

Figure 35-2 In the accompanying figure, the structure responsible for photosynthesis, storage, and support is labeled as:

Correct AnswerverifiedShow Answer

Dissolved sugars are transported in:

Correct AnswerverifiedD

Xylem transports water and dissolved nutrient minerals in which direction?

Correct AnswerverifiedA

Water moves from a region of ____ water potential to a region of ____water potential.

Correct AnswerverifiedShow Answer

According to the pressure-flow model, ____.

Correct AnswerverifiedShow Answer

If you were to take a cross section of a tree from the tropics, would you be able to determine the accurate age of the tree? Why or why not?

Correct AnswerverifiedConcepts to Consider: No. Annual rings c...View AnswerShow Answer

Sugar is translocated in phloem from a source, or an area of ____, to a sink, or an area of ____.

Correct AnswerverifiedShow Answer

Using severed aphid mouthparts, scientists have verified that in most species the phloem translocates mostly ____, but that ____ may also be translocated.

Correct AnswerverifiedShow Answer

Sugars are loaded into sieve tubes via simple diffusion .

Correct AnswerverifiedFalse

Cells produced on the inside of the vascular cambium differentiate to form which vascular tissue?

Correct AnswerverifiedShow Answer

Which of the following is a function of stems?

Correct AnswerverifiedShow Answer

Lenticels function to:

Correct AnswerverifiedShow Answer

____ is when liquid water is forced out of the surface of leaves.

Correct AnswerverifiedShow Answer

How is it possible for water to defy gravity and travel from the roots to the tops of plants? Use the tension-cohesion model to explain your answer.

Correct AnswerverifiedConcepts to Consider: Evaporative pull o...View AnswerShow Answer

Which of the following statements about monocots is true?

Correct AnswerverifiedShow Answer

The transport of xylem sap is the most rapid movement of any material in plants.

Correct AnswerverifiedShow Answer

The loading of dissolved sugars into the sieve tube elements of phloem is:

Correct AnswerverifiedShow Answer

Which of the following statements about heartwood is false ?

Correct AnswerverifiedShow Answer

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D

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Water moves from a region of water potential to a region of water potential.

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Concepts to Consider: No. Annual rings c...
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Sugar is translocated in phloem from a source, or an area of , to a sink, or an area of .

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Using severed aphid mouthparts, scientists have verified that in most species the phloem translocates mostly , but that may also be translocated.

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False

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Concepts to Consider: Evaporative pull o...
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