Chapter 09 – Water in Plants
Chapter 09
Water in Plants
Multiple Choice Questions
1. Pressure that develops within a living cell as a result of water entering the cell is called
2. Osmosis is a special kind of diffusion in which water molecules
Chapter 09 – Water in Plants
3. If the concentration of solutes outside the plant cell is greater than the concentration on the
inside, water will
4. Pressure sufficient to prevent the rise of fluid in an osmometer tube, when applied to the
top of the tube, is called
5. The pressure required to prevent osmosis from taking place is referred to as:
Chapter 09 – Water in Plants
6. When a solute is dissolved in water, the ___________________ of the water is lowered.
Blooms: 2. Understand
7. Water potential is calculated by _____________________.
Blooms: 1. Remember
8. The movement of molecules from a region of high concentration to a region of low
concentration is
Chapter 09 – Water in Plants
9. Molecules that, due to their symmetry, have slightly different electric charges at each end
are said to be
10. Which of the following plays a role in plasmolysis?
11. When an entire plant wilts, it is due to _____________.
Chapter 09 – Water in Plants
12. When starch and cellulose molecules are exposed to water, they develop electrical charges
and form ____________.
Blooms: 1. Remember
13. _______________ occurs when water forms hydrogen bonds with large organic
molecules such as cellulose in living or dead tissues.
14. Imbibition is responsible for _______________________.
Chapter 09 – Water in Plants
15. Active transport in plants apparently involves an enzyme complex that forms a/an
__________.
16. Substances are absorbed and retained against a concentration gradient, through the
expenditure of energy, by _____________________.
17. Most of the water that enters a plant via the roots leaves the same plant by the process of
Chapter 09 – Water in Plants
18. Which of the following is NOT involved in guard cell regulation of stomata opening?
19. Liquid water is forced out of the leaf when leaf pores are closed at night in a process
called
20. The cohesion of water molecules and their adhesion to the walls of narrow tubes that
results in water rising in the tubes is called
Chapter 09 – Water in Plants
21. Changes in solute ion concentrations that are involved in the opening and closing of
stomata pertain primarily to which of the following?
22. Hydathodes are involved directly in which of the following?
Blooms: 1. Remember
23. The early scientist who suggested that cells surrounding xylem vessels perform a pumping
action that propels water through a plant was
Chapter 09 – Water in Plants
24. The rise of water in plants is presently most satisfactorily explained by
25. When humidity is high
26. Plants that have their stomata elevated above the surface include
Chapter 09 – Water in Plants
27. In which of the following situations will the rate of transpiration increase, assuming that
no other variable changes?
28. Approximately how much water typically leaves the plant by transpiration?
Chapter 09 – Water in Plants
29. At present the most widely accepted theory for movement of sugars in the phloem is
called the
30. An area within a plant where food is utilized is called a
Chapter 09 – Water in Plants
31. Many studies leading to our present knowledge of translocation of food in plants utilized
radioactive tracers and
32. Organic molecules produced in photosynthesis are mainly transported in the form of
_______.
Chapter 09 – Water in Plants
33. The direction of movement of food molecules in plants is ______________.
34. The process of loading and transport of food through the phloem tissue involves which
of the following factors?
Chapter 09 – Water in Plants
35. Plants obtain most of their mineral nutrients ______________.
36. Which is an essential trace element in plants?
37. All essential macro- and microelements exist as part of organic molecules in the plant
except
Chapter 09 – Water in Plants
38. Which of the following is an essential micronutrient?
Blooms: 1. Remember
39. Relatively uniform loss of color in leaves, occurring first on the older ones, is usually a
sign of deficiency of which of the following?
40. Which of the following is NOT one of the nutrients that constitute about 99% of the
nutrient total used by plants?
Chapter 09 – Water in Plants
41. Hydroponically grown tomatoes are those that are grown in
True / False Questions
42. Active transport is the reverse of transpiration.
43. A state of equilibrium is reached when molecules are evenly distributed in the space
available to them.
Chapter 09 – Water in Plants
44. Osmotic potential is the amount of pressure needed to make water rise in a narrow tube.
45. The primary force that enables water to move to the top of very tall trees is root pressure.
46. Guttation involves loss of water in liquid form from a leaf.
47. A hydathode is normally located at the tips of a leaf vein.
Chapter 09 – Water in Plants
48. More than 90% of the water entering most plants passes on through the plant.
49. Water and solute molecules never have to enter a cell because they can travel from the
epidermis to the root xylem by moving through the cell walls and spaces between cell walls.
Blooms: 2. Understand
50. Most plants have their stomata closed during the day and open at night.
51. During plasmolysis water leaves a cell’s central vacuole.
Chapter 09 – Water in Plants
52. A differentially permeable membrane is one that permits anything up to the size of large
molecules to pass through.
53. If plasmolyzed cells are placed in fresh water before permanent damage is done, they can
become turgid once more.
54. Tension in the leaf xylem is due to the adhesive and cohesive properties of water as well
as transpiration.
55. Some sort of physiological pump is believed to be involved in active transport.
Chapter 09 – Water in Plants
56. All water that passes through a plant leaves the plant via stomata.
57. The force created by imbibition of water by wooden structures can be used to split stones.