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A-Level AQA Biology > 4.3 Osmosis > Flashcards

4.3 Osmosis Flashcards

1
Q

What is osmosis?

A

Movement of water molecules from an area of higher water potential to an area of lower water potential through a permeable membrane.

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2
Q

What is a solute?

A

Any substances that is dissolved in a solvent.

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3
Q

What is water potential?

A

The pressure created by water molecules

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4
Q

Which Greek letter is used to represent water potential?

A

ψ (psi)

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5
Q

What is water potential measured in?

A

kPa (kilopascal)

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6
Q

What is the water potential of pure water?

A

0

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7
Q

Is water potential always more than 0 or less than 0?

A

Less than 0

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8
Q

What will happen to the water potential as the amount of solute increases?

A

Lower

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9
Q

What is hypertonic?

A

When the concentration of solute is higher than the concentration in cell.

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10
Q

What is hypotonic?

A

When the concentration of solute is lower than the concentration in cell.

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11
Q

What is isotonic?

A

When the concentration of solute is equal to the concentration in cell.

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12
Q

What is the net movement of water if a cell is in a hypertonic solution?

A

Leave the cell

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13
Q

What is the net movement of water if a cell is in a hypotonic solution?

A

Enter the cell

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14
Q

What is the net movement of water if a cell is in an isotonic solution?

A

Neither enters or leaves the cell

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15
Q

What will happen to an animal cell if it is in a hypertonic solution?

A

Shriveled

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16
Q

What will happen to an animal cell if it is in a hypotonic solution?

A

Bursts

17
Q

What will happen to an animal cell if it is in an isotonic solution?

A

No change (normal)

18
Q

What will happen to a plant cell if it is in a hypertonic solution?

A

Plasmolysed

19
Q

What will happen to a plant cell if it is in a hypotonic solution?

A

Turgid (normal)

20
Q

What will happen to a plant cell if it is in an isotonic solution?

A

Flaccid

21
Q

Why does the plant cell not burst even in a hypotonic solution?

A

Because the cell wall helps to prevent from bursting.

A-Level AQA Biology (31 decks)

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