1. What does water potential indicate in a plant cell?
A.
The ability of water to move
B.
The amount of chlorophyll present
C.
The rate of respiration
D.
The amount of starch stored
Correct Answer:
The ability of water to move
Explanation:
Water potential indicates the tendency or ability of water to move from one region to another.
2. What is the symbol commonly used for water potential?
A.
Ψw
B.
Ψs
C.
Ψp
D.
ATP
Correct Answer:
Ψw
Explanation:
Water potential is commonly represented by the symbol Ψw.
3. What is the water potential of pure water under standard conditions?
A.
Zero
B.
One
C.
Minus one
D.
Infinite
Correct Answer:
Zero
Explanation:
Pure water under standard conditions is assigned a water potential of zero.
4. In which direction does water generally move according to water potential?
A.
From higher water potential to lower water potential
B.
From lower water potential to higher water potential
C.
From equal water potential to higher water potential
D.
Without relation to water potential
Correct Answer:
From higher water potential to lower water potential
Explanation:
Water moves down a water potential gradient, from a region of higher water potential to a region of lower water potential.
5. Which water potential value is generally found in a concentrated cell sap?
A.
Negative
B.
Always zero
C.
Always positive
D.
Infinite
Correct Answer:
Negative
Explanation:
Dissolved solutes lower the water potential of cell sap, often making it negative.
6. What is the usual unit used to express water potential?
A.
Megapascal
B.
Gram
C.
Mole
D.
Degree Celsius
Correct Answer:
Megapascal
Explanation:
Water potential is a pressure measurement and is commonly expressed in megapascals (MPa).
7. Which component lowers water potential when solutes are added to water?
A.
Solute potential
B.
Pressure potential
C.
Light potential
D.
Heat potential
Correct Answer:
Solute potential
Explanation:
Solute potential, also called osmotic potential, becomes more negative as solutes are added and therefore lowers water potential.
8. What happens to water potential when the concentration of dissolved solutes increases?
A.
It decreases
B.
It increases
C.
It remains exactly zero
D.
It becomes unrelated to water movement
Correct Answer:
It decreases
Explanation:
An increase in dissolved solutes makes the solute potential more negative, causing water potential to decrease.
9. Why does water enter a dry seed during imbibition?
A.
The dry seed has a lower water potential than the surrounding water
B.
The dry seed has a higher water potential than the surrounding water
C.
The seed produces water by photosynthesis
D.
The surrounding water has no water potential
Correct Answer:
The dry seed has a lower water potential than the surrounding water
Explanation:
During imbibition, water moves into the dry seed because the seed materials have lower water potential than the surrounding water.
10. A region with lower water potential has what effect on water movement?
A.
It attracts water from a region with higher water potential
B.
It prevents all water movement
C.
It pushes water toward a region with higher water potential
D.
It changes water into a solute
Correct Answer:
It attracts water from a region with higher water potential
Explanation:
Water moves toward the region with lower water potential, which explains water absorption during imbibition.
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