Question 1

Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?

Accepted Answer

A)   Not all soils have high concentrations of ions.
B)   Root pressure requires movement of water into the xylem from surrounding cells in the roots.
C)   Over long distances, the force of root pressure is not enough to overcome the force of gravity.
D)   There is no water potential gradient between roots and shoots.

Question 2

Which of the following accurately describes the direction phloem sap can flow?

Accepted Answer

A)   from leaves to stems only
B)   from stems to leaves only
C)   from leaves to roots only
D)   from leaves to roots or roots to leaves

Question 3

Which of the following structures or molecules are required for active transport of amino acids in plants?

Accepted Answer

A)   channel proteins
B)   vascular tissue
C)   sodium/potassium pumps
D)   ATP, transport proteins, and a proton gradient

Question 4

When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. Which of the following explains why this does not happen to plant cells?

Accepted Answer

A)   they have large central vacuoles, which provide abundant space for storage of incoming water
B)   they have cell walls, which prevent the entry of water by osmosis
C)   they have cell walls, which provide pressure to counteract the pressure of the incoming water
D)   certain gated channel proteins embedded in their plasma membranes open as osmotic pressure decreases, allowing excess water to leave the cell

Question 5

Which of the following primarily enters a plant somewhere other than through the roots?

Accepted Answer

A)   carbon dioxide
B)   nitrogen
C)   potassium
D)   water

Question 6

Which of the following describes the transmembrane route for transport within plant tissue?

Accepted Answer

A)   water and solutes move out of one cell, across the cell wall, and into the neighboring cell
B)   water and solutes move out of one cell, through the plasmodesmata, and into the neighboring cell
C)   water moves out of one cell, across the cell wall, and into the neighboring cell
D)   solutes move out of one cell, across the plasmodesmata, and into the neighboring cell

Question 7

Which structure or compartment is part of the symplast?

Accepted Answer

A)   the interior of a vessel element
B)   the interior of a sieve tube
C)   the cell wall of a mesophyll cell
D)   an extracellular air space

Question 8

Which of the following is a result of the high surface-to-volume ratio of leaves?

Accepted Answer

A)   thick leaves
B)   decreased light absorption
C)   increased CO2 absorption
D)   decreased transpiration

Question 9

If a water molecule in a plant 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 which of the following?

Accepted Answer

A)   only the xylem
B)   only the phloem
C)   only the endodermis
D)   both the xylem and the phloem

Question 10

Which of the following describes the Casparian strip in plant roots?

Accepted Answer

A)   it contains dense clusters of plasmodesmata
B)   it forms within primary cell walls
C)   it contains waxy deposits of cutin
D)   it forms an impermeable barrier through the cytoplasm of endodermal cells

Question 11

Which of the following is a correct statement about sugar movement in phloem?

Accepted Answer

A)   Diffusion can account for the observed rates of transport.
B)   Movement can occur both upward and downward in the plant.
C)   Sugar is translocated from sinks to sources.
D)   Only phloem cells with nuclei can perform sugar movement.

Question 12

Which process provides the main force driving water within xylem vessels?

Accepted Answer

A)   active transport of ions into the stele
B)   evaporation of water through stoma
C)   the force of root pressure
D)   osmosis in the root

Question 13

Which of the following defines the loss of water from the aerial parts of plants?

Accepted Answer

A)   homeostasis
B)   respiration
C)   gas exchange
D)   transpiration

Exam 36: Transport in Vascular Plants

Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?

Correct Answer
verified

Which of the following describes the transmembrane route for transport within plant tissue?

Correct Answer
verified

Which of the following structures or molecules are required for active transport of amino acids in plants?

Correct Answer
verified

Which of the following primarily enters a plant somewhere other than through the roots?

Correct Answer
verified

Which of the following defines the loss of water from the aerial parts of plants?

Correct Answer
verified

Which of the following describes the Casparian strip in plant roots?

Correct Answer
verified

Which of the following is a result of the high surface-to-volume ratio of leaves?

Correct Answer
verified

If a water molecule in a plant 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 which of the following?

Correct Answer
verified

Which process provides the main force driving water within xylem vessels?

Correct Answer
verified

Which of the following is a correct statement about sugar movement in phloem?

Correct Answer
verified

Which of the following accurately describes the direction phloem sap can flow?

Correct Answer
verified

Which structure or compartment is part of the symplast?

Correct Answer
verified

When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. Which of the following explains why this does not happen to plant cells?

Correct Answer
verified

Exam 36: Transport in Vascular Plants

Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?

Correct AnswerverifiedShow Answer

Which of the following describes the transmembrane route for transport within plant tissue?

Correct AnswerverifiedShow Answer

Which of the following structures or molecules are required for active transport of amino acids in plants?

Correct AnswerverifiedShow Answer

Which of the following primarily enters a plant somewhere other than through the roots?

Correct AnswerverifiedShow Answer

Which of the following defines the loss of water from the aerial parts of plants?

Correct AnswerverifiedShow Answer

Which of the following describes the Casparian strip in plant roots?

Correct AnswerverifiedShow Answer

Which of the following is a result of the high surface-to-volume ratio of leaves?

Correct AnswerverifiedShow Answer

If a water molecule in a plant 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 which of the following?

Correct AnswerverifiedShow Answer

Which process provides the main force driving water within xylem vessels?

Correct AnswerverifiedShow Answer

Which of the following is a correct statement about sugar movement in phloem?

Correct AnswerverifiedShow Answer

Which of the following accurately describes the direction phloem sap can flow?

Correct AnswerverifiedShow Answer

Which structure or compartment is part of the symplast?

Correct AnswerverifiedShow Answer

When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. Which of the following explains why this does not happen to plant cells?

Correct AnswerverifiedShow Answer

Correct Answer
verified

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Correct Answer
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