What is water potential?
AP Biology Water Potential Problems

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Biology
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9th - 12th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
Water potential is the potential energy of water in a system compared to pure water, measured in bars. It determines the direction of water movement.
2.
FLASHCARD QUESTION
Front
What are the two main components of water potential?
Back
The two main components of water potential are solute potential (osmotic potential) and pressure potential.
3.
FLASHCARD QUESTION
Front
How is solute potential calculated?
Back
Solute potential (Ψs) can be calculated using the formula Ψs = -iCRT, where i is the ionization constant, C is the molar concentration, R is the pressure constant (0.0831 liter bar per mole per Kelvin), and T is the temperature in Kelvin.
4.
FLASHCARD QUESTION
Front
What is pressure potential?
Back
Pressure potential (Ψp) is the physical pressure exerted on a solution, which can be positive (turgor pressure in plant cells) or negative (tension in xylem).
5.
FLASHCARD QUESTION
Front
If a cell has a water potential of -1.5 bars and is placed in a solution with a water potential of -4 bars, which way will water move?
Back
Water will move out of the cell, from an area of higher water potential to an area of lower water potential.
6.
FLASHCARD QUESTION
Front
What happens to a plant cell in a hypertonic solution?
Back
In a hypertonic solution, water moves out of the plant cell, causing it to lose turgor pressure and potentially undergo plasmolysis.
7.
FLASHCARD QUESTION
Front
What is the effect of placing a plant cell in distilled water?
Back
Placing a plant cell in distilled water (hypotonic solution) causes water to move into the cell, increasing turgor pressure and making the cell swell.
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