Plant Physiology and Water Relations - One Line Questions

1. Which of the following conditions would favor the highest rate of transpiration? — A hot, dry, windy day
2. What type of solution would cause a plant cell to become flaccid? — An isotonic solution
3. Which of the following processes is the primary mechanism for water absorption by plant roots? — Osmosis
4. Xylem vessels are dead cells that are hollow tubes, which facilitates: — Bulk flow of water with minimal resistance
5. The process by which plants absorb water from the soil into their roots is primarily driven by: — Differential water potential between soil and root cells
6. In the pressure-flow hypothesis, the loading of sugars into the phloem sieve tubes at the source leads to: — An increase in pressure potential, driving flow towards the sink
7. Water movement from cell to cell through plasmodesmata is called the: — Symplast pathway
8. The bulk flow of water in the xylem is a passive process driven by: — Water potential gradients
9. The movement of photosynthates from source (e.g., leaves) to sink (e.g., roots, fruits) through the phloem is explained by the: — Pressure-flow hypothesis
10. The opening and closing of stomata are regulated by changes in the turgor of which cells? — Guard cells
11. The Casparian strip, located in the endodermis, is crucial because it: — Blocks the apoplast pathway, forcing water into the symplast
12. During stomatal opening, guard cells become: — Turgid due to influx of potassium ions and water
13. Which of the following factors generally increases the rate of transpiration? — High wind speed
14. The movement of water into the phloem sieve tube elements at the source is primarily driven by: — High solute potential
15. The ability of plants to absorb water from dry soil is related to their: — Low solute potential in root cells
16. During the process of osmosis, water moves from: — Higher water potential to lower water potential
17. Water moves from the soil into root hair cells primarily due to: — Lower water potential in root hair cells than in the soil
18. Plasmolysis occurs when a plant cell is placed in a solution that is: — Hypertonic
19. What happens to the water potential of a plant cell when it absorbs solutes? — It decreases
20. Which of the following is an adaptation of plants living in arid environments to reduce water loss? — Numerous, sunken stomata
21. Pressure potential (Ψp), also known as turgor pressure, is typically: — Positive in root cells
22. The rate of transpiration is generally higher during which part of the day? — Midday
23. When a plant cell is placed in a hypotonic solution, water will move: — Into the cell, causing turgor
24. The overall process of water uptake by roots, transport through xylem, and loss from leaves is known as: — Transpiration stream
25. The movement of water across the root endodermis is primarily through the symplast pathway due to the presence of: — Casparian strips
26. Solute potential (Ψs) is always: — Negative
27. When a plant cell is in equilibrium with its surroundings, its water potential is: — Zero
28. The tension created by transpiration pulls water up the xylem. This tension is a form of: — Negative pressure
29. Abscisic acid (ABA) is a plant hormone that generally: — Inhibits stomatal opening and promotes closure
30. The primary function of water in plants, besides being a solvent and reactant, is: — Providing structural support through turgor pressure
31. Which of the following is NOT a function of water in plant physiology? — Primary source of energy for respiration
32. Which plant structure is primarily responsible for controlling transpiration? — Stomata
33. Root pressure can push water up to a certain height, but it is generally not sufficient to explain the transport of water to the: — Shoot apex of tall trees
34. The bulk flow of water through the xylem is driven by: — Transpiration pull
35. What is the primary driving force for the ascent of sap in tall trees? — Transpiration pull
36. The cohesion-tension theory explains water transport in xylem based on: — Cohesion of water molecules and tension created by transpiration
37. Which component of water potential is most likely to be zero in an open container of pure water at standard atmospheric pressure? — Pressure potential (Ψp)
38. The pathway through the root cortex where water moves via the cell walls and intercellular spaces is known as the: —
39. What is water potential (Ψw) primarily influenced by in plant cells? — Solute potential and pressure potential
40. When a plant wilts, its leaves lose turgor pressure because: — The cells are losing water and pressure potential drops
41. Waterlogging of soil can lead to wilting because: — Oxygen supply to roots is reduced, inhibiting active water absorption
42. What is the role of aquaporins in plant water relations? — They facilitate rapid water transport across membranes
43. The movement of water from a region of higher water potential to a region of lower water potential across a semipermeable membrane is called: — Osmosis
44. Guttation is the loss of water in liquid form from plant leaves, typically occurring when: — Transpiration is inhibited (e.g., at night) and root pressure is high
45. Transpiration is the process of: — Water loss in the form of vapor from aerial parts of the plant
46. Phloem is primarily responsible for the transport of: — Sugars (photosynthates)
47. Adhesion in the context of water transport refers to the attraction between: — Water molecules and the walls of xylem vessels
48. Cohesion refers to the attraction between: — Water molecules themselves
49. The process of imbibition is crucial for: — Water absorption by dry seeds
50. The rate of transpiration is inversely proportional to: — Humidity
All One Line Questions
E-Book Plant Physiology and Water Relations Audio Book Plant Physiology and Water Relations Online Test Plant Physiology and Water Relations Question Bank Plant Physiology and Water Relations