Question 1

Which adaptation is most likely found in the plant shown in the first image (succulent, stone-like leaves) to minimize water loss in arid environments?

Accepted Answer

Reduced leaf surface area and thick, fleshy leaves for water storage

Question 2

Which of the following best describes the main function of mycorrhizae as shown in the image with roots and fungus?

Accepted Answer

They increase the surface area for water and mineral absorption

Question 3

A plant cell is placed in a solution with a lower water potential ($$\psi) $$than its cytoplasm. What will happen to the cell?

Accepted Answer

It will undergo plasmolysis as water leaves the cell

Question 4

Which equation correctly represents the relationship between water potential, solute potential, and pressure potential in plant cells?

Accepted Answer

$$\psi = \psi_p + \psi_s$$

Question 5

What is the primary driving force for the bulk flow of water and minerals in the xylem from roots to leaves?

Accepted Answer

Transpiration pull due to evaporation of water from leaves

Question 6

Which of the following best explains why desert plants typically have fewer stomata than plants in moist forests?

Accepted Answer

To reduce water loss through transpiration

Question 7

A plant is exposed to high temperatures and drought. Which hormone is most likely to be produced to induce stomatal closure?

Accepted Answer

Abscisic acid (ABA)

Question 8

Which of the following statements about phloem transport is correct?

Accepted Answer

Phloem sap movement is driven by positive pressure generated by active loading of sugars

Question 9

If a plant cell's solute potential ($$\psi_s) is$$ $$-0.7$$ MPa and its pressure potential ($$\psi_p) is$$ $$0.5$$ MPa, what is its total water potential ($$\psi$$)?

Accepted Answer

$$\psi = -0.2$$ MPa

Question 10

Which process is responsible for the opening of stomata in response to light?

Accepted Answer

Active transport of K$$^+$$ ions into guard cells, followed by water uptake

Question 11

Which route allows water and minerals to move through the cell walls and intercellular spaces without crossing the plasma membrane?

Accepted Answer

Apoplastic route

Question 12

A plant wilts when water is not available. What is the most direct cause of wilting?

Accepted Answer

Loss of turgor pressure in plant cells

Question 13

Which of the following best describes the cohesion-tension hypothesis for water movement in plants?

Accepted Answer

Transpiration creates negative pressure that pulls water upward, with cohesion and adhesion aiding the process

Question 14

Which of the following is a likely consequence of cavitation in the xylem?

Accepted Answer

Formation of air bubbles that block water transport

Question 15

Why do plants in high light environments often have opposite phyllotaxy?

Accepted Answer

To minimize leaf overlap and maximize light capture

Question 16

Which of the following is true about the movement of water by osmosis in plant cells?

Accepted Answer

Water moves from areas of higher water potential to lower water potential

Question 17

Which of the following is a real-world application of understanding phloem transport in agriculture?

Accepted Answer

Using aphids to sample phloem sap and monitor plant health

Question 18

Which of the following best explains why guttation occurs in some plants?

Accepted Answer

Root pressure forces water out of hydathodes when transpiration is low

Question 19

Which of the following is NOT a trigger for stomatal opening?

Accepted Answer

High wind and high temperature

Resource Acquisition and Transport in Vascular Plants

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