A student places an animal cell and a plant cell into distilled water and notes the following observations.
Animal cell: swells and then bursts.
Plant cell: swells.
What is the reason for this difference?
Plant cell surface membranes are partially permeable
Animal cells have no vacuole
Animal cells have no cell wall
Plant cell walls are freely permeable
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What will happen to a plant cell placed in a hypotonic solution?
It will burst
It will swell with water and become turgid
Nothing will happen
It will shrink and shrivel and become flaccid
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Which of the following is the correct equation used to calculate water potential?
Ψw = Ψs + Ψp
Ψw = Ψs - Ψp
Ψw = Ψp - Ψs
Ψw = Ψs ÷ Ψp
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The diagram below shows red blood cells that have been bathed in solutions of different solute concentration.
Which row of the table correctly describes the three solutions that these red blood cells have been bathed in?
| I | II | III |
A | Isotonic | Hypotonic | Isotonic |
B | Isotonic | Hypertonic | Hypotonic |
C | Isotonic | Hypotonic | Hypertonic |
D | Hypertonic | Hypotonic | Isotonic |
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The graph below shows the outcome of an experiment investigating the change in mass of potato chips placed in sucrose solutions of different concentrations.
Which of the following statements about the graph is not correct?
The point where the line crosses the X axis is called the isotonic solute concentration.
There is not a significant difference between the change in mass values at every solute concentration.
The least osmosis took place when the sucrose solution was 1.0 mol dm3.
The bigger the error bars, the lower the confidence in the reliability of the data.
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When investigating osmosis in plant tissue any changes to mass and length are recorded over a period of time.
What are the most appropriate units of measurement for mass and length during this investigation?
kg and cm
g and cm
g and mm
kg and mm
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An experiment to calculate the water potential of potato cells was performed using the following protocol:
Dice potato into 1cm3 cubes.
Add potato cubes to 6 test tubes, each containing solution with a different sucrose concentration.
Wait 12 hours.
Weigh the cubes from each test tube and plot a graph.
The mean mass of the potato cubes was 2.50 g before being added to the solution, and the graph shows the masses of the potato cubes after the experiment.
Which concentration of sucrose matches the water potential of the potato cells?
0.00 mol dm-3
0.12 mol dm-3
0.31 mol dm-3
0.66 mol dm-3
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