Question 1

Which of the following best explains why xylem tissue is composed of dead cells at functional maturity?

Accepted Answer

Dead cells allow for the rapid and unimpeded bulk flow of water and minerals by reducing resistance within the tubes.

Question 2

A plant cell with a solute potential $$\Psi_s = -0.5$$ MPa is placed in pure water ($$\Psi = 0$$ MPa). What will happen to the cell?

Accepted Answer

Water will enter the cell by osmosis, increasing turgor pressure.

Question 3

Which of the following statements about bulk flow in plants is correct?

Accepted Answer

Bulk flow occurs due to pressure gradients and is independent of solute concentration.

Question 4

A plant is watered with a hypertonic solution. What is the most likely outcome for the plant cells?

Accepted Answer

Cells will lose water, become flaccid, and the plant will wilt.

Question 5

Which equation correctly represents water potential in plant cells?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 6

Why do most angiosperms have alternate (spiral) phyllotaxy with leaves emerging about 137 degrees from the previous leaf?

Accepted Answer

To minimize shading of lower leaves and maximize light capture.

Question 7

Which of the following best describes the role of aquaporins in plant cells?

Accepted Answer

They facilitate the rapid movement of water molecules across cell membranes.

Question 8

A plant cell is placed in an isotonic solution. What will happen to the cell's turgor pressure?

Accepted Answer

Turgor pressure will be zero, and the cell will be flaccid.

Question 9

Which process is primarily responsible for the upward movement of water from roots to leaves during the day?

Accepted Answer

Transpiration-driven cohesion-tension mechanism.

Question 10

If a plant's leaves are vertically oriented, what is the most likely adaptive advantage?

Accepted Answer

Minimizing overexposure to sunlight and reducing water loss.

Question 11

Which of the following is NOT a characteristic of bulk flow in the xylem?

Accepted Answer

It is driven by differences in solute concentration.

Question 12

A plant cell with $$\Psi = -0.7$$ MPa is placed in a solution with $$\Psi = -0.3$$ MPa. What will be the direction of water movement?

Accepted Answer

Water will move into the cell.

Question 13

Which of the following best describes the function of phloem tissue?

Accepted Answer

Transporting sugars and organic nutrients throughout the plant.

Question 14

Which scenario would most likely result in guttation in a plant?

Accepted Answer

Root pressure pushes more water into the leaves than is lost by transpiration at night.

Question 15

Which of the following is a direct consequence of the cohesion-tension hypothesis?

Accepted Answer

Water in the xylem is under negative pressure, allowing it to be pulled upward from roots to leaves.

Question 16

A plant growing in a dry, high-light environment is most likely to have which of the following leaf adaptations?

Accepted Answer

Small, vertically oriented leaves to reduce water loss.

Question 17

Which of the following best explains why roots branch extensively in areas of high resource availability?

Accepted Answer

To maximize absorption of water and minerals from nutrient-rich soil.

Question 18

Which of the following statements about water potential is correct?

Accepted Answer

Water moves from regions of higher water potential to regions of lower water potential.

Question 19

Which of the following is a real-world application of understanding tonicity in plants?

Accepted Answer

Avoiding the use of salty water for irrigation to prevent plant wilting.

Question 20

A plant cell is bathed in a solution with a higher solute concentration than its cytoplasm. What will happen to the cell?

Accepted Answer

It will lose water and become flaccid.

Resource Acquisition and Transport in Vascular Plants

스터디 가이드 - 연습 문제