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Paper 1
Cell Biology
Osmosis
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Created by
Bella Wöbcke
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Cards (13)
What is osmosis?
Osmosis is the
diffusion
of water from a dilute solution to a concentrated solution through a
partially permeable membrane
.
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How does osmosis differ from diffusion?
Osmosis specifically refers to the movement of water, while diffusion refers to the movement of
particles
in general.
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What happens to an animal cell placed in pure water?
The cell will expand and may burst due to water moving in by
osmosis
.
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What is the effect of placing an animal cell in a concentrated solution?
Water will move out of the cell by
osmosis
, causing the cell to shrink.
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What is a characteristic of a dilute sugar solution?
A dilute sugar solution contains a high
concentration
of water.
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What happens to a plant cell when placed in water?
The plant cell will expand due to water moving in by
osmosis
, becoming
turgid
.
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Why does a plant cell not burst when it becomes turgid?
The
cell wall
prevents the plant cell from bursting when it becomes turgid.
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What occurs when a plant cell is placed in a concentrated solution?
Water moves out of the plant cell by
osmosis
, causing the cell to shrink and become
flaccid
.
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What are the key points about osmosis in animal and plant cells?
Osmosis is the
diffusion
of water through a
partially permeable membrane
.
In animal cells:
Water entering causes expansion and potential bursting.
Water leaving causes shrinking.
In plant cells:
Water entering causes
turgidity
(swelling without bursting).
Water leaving causes
flaccidity
(shrinking).
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What is the role of a partially permeable membrane in osmosis?
A partially permeable membrane allows water molecules to pass through but not
sugar molecules
.
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How do scientists describe concentrated solutions in terms of water concentration?
Concentrated solutions contain a
low
concentration of water.
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What is the effect of osmosis on the cytoplasm of cells?
The cytoplasm of cells is a relatively
concentrated
solution, meaning it has a low
concentration
of water.
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What happens to the concentration of water during osmosis when comparing two solutions?
Water moves from an area of
higher
concentration to an area of
lower
concentration.
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