Plant Physiology and Water Relations - Question Bank
1. Which of the following conditions would favor the highest rate of transpiration?
2. The overall process of water uptake by roots, transport through xylem, and loss from leaves is known as:
3. During the process of osmosis, water moves from:
4. The movement of water into the phloem sieve tube elements at the source is primarily driven by:
5. Which component of water potential is most likely to be zero in an open container of pure water at standard atmospheric pressure?
6. The rate of transpiration is inversely proportional to:
7. What is the role of aquaporins in plant water relations?
8. The tension created by transpiration pulls water up the xylem. This tension is a form of:
9. When a plant cell is in equilibrium with its surroundings, its water potential is:
10. The process of imbibition is crucial for:
11. Which of the following is an adaptation of plants living in arid environments to reduce water loss?
12. Water moves from the soil into root hair cells primarily due to:
13. The bulk flow of water in the xylem is a passive process driven by:
14. Abscisic acid (ABA) is a plant hormone that generally:
15. The movement of water across the root endodermis is primarily through the symplast pathway due to the presence of:
16. What type of solution would cause a plant cell to become flaccid?
17. The rate of transpiration is generally higher during which part of the day?
18. Which of the following is NOT a function of water in plant physiology?
19. When a plant wilts, its leaves lose turgor pressure because:
20. In the pressure-flow hypothesis, the loading of sugars into the phloem sieve tubes at the source leads to:
21. The movement of photosynthates from source (e.g., leaves) to sink (e.g., roots, fruits) through the phloem is explained by the:
22. Phloem is primarily responsible for the transport of:
23. Xylem vessels are dead cells that are hollow tubes, which facilitates:
24. The primary function of water in plants, besides being a solvent and reactant, is:
25. What happens to the water potential of a plant cell when it absorbs solutes?
26. The ability of plants to absorb water from dry soil is related to their:
27. Waterlogging of soil can lead to wilting because:
28. Which of the following factors generally increases the rate of transpiration?
29. The process by which plants absorb water from the soil into their roots is primarily driven by:
30. Guttation is the loss of water in liquid form from plant leaves, typically occurring when:
31. Root pressure can push water up to a certain height, but it is generally not sufficient to explain the transport of water to the:
32. What is the primary driving force for the ascent of sap in tall trees?
33. Adhesion in the context of water transport refers to the attraction between:
34. Cohesion refers to the attraction between:
35. The cohesion-tension theory explains water transport in xylem based on:
36. During stomatal opening, guard cells become:
37. The opening and closing of stomata are regulated by changes in the turgor of which cells?
38. Which plant structure is primarily responsible for controlling transpiration?
39. Transpiration is the process of:
40. The bulk flow of water through the xylem is driven by:
41. The Casparian strip, located in the endodermis, is crucial because it:
42. Water movement from cell to cell through plasmodesmata is called the:
43. The pathway through the root cortex where water moves via the cell walls and intercellular spaces is known as the:
44. Plasmolysis occurs when a plant cell is placed in a solution that is:
45. When a plant cell is placed in a hypotonic solution, water will move:
46. Pressure potential (Ψp), also known as turgor pressure, is typically:
47. Solute potential (Ψs) is always:
48. What is water potential (Ψw) primarily influenced by in plant cells?
49. The movement of water from a region of higher water potential to a region of lower water potential across a semipermeable membrane is called:
50. Which of the following processes is the primary mechanism for water absorption by plant roots?