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1
Molecules moving from a region of high concentration to a region of lower concentration are said to be moving against a diffusion gradient.
A)True
B)False
2
During imbibition, large molecules such as cellulose and starch will develop electrical charges and attract water molecules.
A)True
B)False
3
Translocation is the process whereby water vapor is expelled from the leaf.
A)True
B)False
4
The pressure-flow hypothesis states that organic solutes flow from a source to a sink.
A)True
B)False
5
Essential elements are those nutrients that are needed by the plant in very small amounts.
A)True
B)False
6
Commercial fertilizer contains primarily nitrogen, phosphorous, and potassium.
A)True
B)False
7
The pressure that develops against the cell wall as a result of water entering the vacuole of the cell is called
A)osmotic potential.
B)plasmolysis.
C)pressure potential.
D)diffusion.
8
When a plant cell is placed in a salt solution, it loses water because
A)the water potential inside the cell is greater than outside.
B)the water potential outside the cell is greater than inside.
C)the pressure potential increases.
D)the vacuolar membrane is permanently destroyed.
9
Plants require water for
A)enzyme and chemical activity.
B)cell content.
C)photosynthesis.
D)all of the above.
10
The theory that explains the pulling force of water as it evaporates from leaves is called the
A)root pressure theory.
B)cohesion-tension theory.
C)pressure-flow hypothesis.
D)active transport theory.
11
Which of the following substances is associated with the deflation of guard cells?
A)abscisic acid
B)nitrogen
C)mannitol
D)proline
12
Which element is associated with guard cell expansion and deflation?
A)N
B)P
C)K
D)Al
13
Which type of plant might have a recessed stomatal apparatus?
A)tropical
B)desert
C)marine
D)aquatic
14
What is the term used to describe the loss of liquid water from the surface of a leaf?
A)transpiration
B)bulk flow
C)pressure flow
D)guttation
15
What is the name of the process whereby sugar enters sieve tubes by means of active transport?
A)phloem-loading
B)guttation
C)bulk flow
D)cohesion
16
Which of the following elements is a macronutrient?
A)copper
B)iron
C)magnesium
D)manganese





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