Deck 38: Flowering Plants: Transport

Question 1

Measurement of relative water content (RWC) can be used to predict a:

A) plant's ability to recover from cell collapsing
B) wilted condition
C) need for fertilizers
D) cold shock
E) salt tolerance

Answer 1

wilted condition

Question 2

One use of knowledge of relative water content (RWC) would be to develop plants for:

A) tolerance of water stress
B) salt tolerance
C) heat tolerance
D) shock tolerance
E) mineral tolerance

Answer 2

tolerance of water stress

Question 3

If scientists want to develop plants better adapted to certain climates they need information about the plant's ability to:

A) bind membrane proteins
B) transport solutes passively
C) make dehydrins
D) take up minerals
E) transport calcium

Answer 3

make dehydrins

Question 4

Water potential is especially important when considering the plant's need for:

A) fertilizers
B) vitamins
C) water
D) osmotic adjustment
E) dissolved solutes

Question 5

Knowledge of halophyte plant functions have given scientists clues for developing agricultural plants that might survive in environments that are:

A) extremely wet
B) high pressure areas such as mountains
C) high in toxic wastes
D) extremely cold
E) arid

Question 6

Which one of the following explains what xylem loading is?

A) when the xylem is filled with sugars
B) right after the xylem is filled with minerals
C) when the xylem is filled with water
D) xylem loading never occurs
E) phloem has given up its water to the xylem

Question 7

One application of the knowledge of sugar flow in xylem allows for the collecting of sap from maple trees in the:

A) summer
B) winter
C) fall
D) early spring
E) None of these is correct

Question 8

Which one of the following cell types is found only in flowering plants?

A) vessels
B) tracheids
C) parenchyma
D) sieve tubes
E) epidermis

Question 9

When scientists used flaps on the same plant to make observations of water flow they were attempting to remove the possibility of:

A) artificial results
B) experimental variation
C) differentiated results
D) separation factors
E) alignment factors

Question 10

Which of the following are features of guard cells that enable them to function?

A) thick inner walls
B) chloroplasts
C) cellulose microfibrils
D) their shape
E) All of these are true

Question 11

Which of the following is NOT associated with leaf abscission?

A) development of suberin impregnated cork cells
B) cell wall development
C) development of a separation layer
D) water stress
E) deciduous trees

Question 12

Which one of the following is NOT associated with phloem tissues?

A) sieve tubes
B) companion cells
C) tracheids
D) parenchyma cells
E) plasmodesmata

Question 13

One possible reason for the lack of a nucleus in sieve-tube cells may be that the nucleus would:

A) impede bulk flow
B) cause the cell to die
C) pass through the plasmodesmata and disrupt bulk flow
D) cause the cell plate not to form
E) interfere with bulk flow in the xylem

Question 14

Phloem loading is a primary example of how ________ processes occur in plant tissues.

A) apoplastic
B) plasmodesmatal plugging
C) bulk flow upward
D) symplastic
E) sugar transport without membranes

Question 15

Vessels of the xylem are dead cells and therefore can transport water and minerals upward in the plant.

Question 16

Plants that grow in salt marshes must have a mechanism for coping with potential osmotic stress in their cells.

Question 17

When plants take up water and minerals these must pass through both a cell wall and a membrane.

Question 18

Diffusion of water across membranes occurs through channels formed by proteins known as aquaporins.

Question 19

If your plants are wilted, this is an indication that the turgor pressure in cells of that plant are low.

Question 20

Scientists developing drought tolerant plants can use the knowledge of relative water content as models for predicting how these plants will respond to stress.

Question 21

One possible explanation for the reason water can be transported up the vessels in plants is because of adhesion of water to the lignified walls.

Question 22

Given the same driving force, water transport in vessels is more rapid than that in tracheids because of the end wall perforation of vessels.