Cells: Osmosis Flashcards

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1
Q

What does osmosis involve?

A

The diffusion of water through a membrane.

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2
Q

Does the membrane in osmosis need to be living?

A

No. The membrane can be artificial e.g. cellophane

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3
Q

During osmosis the membrane must be what?

A

Permeable to water.

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4
Q

What happens when a concentrated solution is separated from a dilute solution by a suitable membrane?

A

Water will pass from the dilute to the concentrated solution.

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5
Q

What is selectively permeable mean?

A

When the membrane allows only molecules of a certain size to diffuse through it.

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6
Q

True or False. If the cell call freely permeable to water?

A

True

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7
Q

If there is water outside a plant cell what will happen?

A

It will diffuse through osmosis into the vacuole.

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8
Q

What happens to the vacuole during osmosis?

A

The vacuole will expand, pushing the cytoplasm outwards against the cell wall.

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9
Q

Can the cellulose cell stretch?

A

No.

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10
Q

The pressure of the vacuole against the cell wall makes it what?

A

Very firm.

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11
Q

What happens if a plant cell is turgid?

A

The plant will be firm and upright and the leaves will be expanded.

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12
Q

What happens if the concentration of the cell sap is greater in one cell then its neighbor?

A

Water will pass by osmosis from the less concentrated to the more concentrated.

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13
Q

What does cell division cause?

A

Increase in the number of cells.

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14
Q

What is cell expansion?

A

The increase of the size of the cell

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15
Q

True or False. Cell division followed by cell expansion causes growth?

A

True.

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16
Q

In fresh water fish their blood is more concentrated than the surrounding water? How do they take in water?

A

Through osmosis.

17
Q

In sea water fish the sea water is more concentrated solution than the fish’s blood, what will be the osmotic effect?

A

A sea water fish will lose water through osmosis. The fish drinks sea water and the gills expel the excess salt from the blood. Keeping its concentration constant.