Diffusion and osmosis

Osmosis is the movement of ________ molecules from a ___________ to a _____________ solution across a partially permeable membrane. (type the 3 words below each separated by a space)

A membrane that lets smaller molecules pass through by not larger molecules is said to be ____________ ______________. (2 words)

A solution that has a high concentration of water is said to be __________.

A concentrated solution has a __________ concentration of ____________________.

• High. Dissolved substances.

• Low. Dissolved substances.

• High. Water.

Where will the water go?

• Into the cell

• Out of the cell

• Equally in & out - it's isotonic

• There is no water

In which case would a cell most likely shrink?

• when placed in a solution containing a high salt concentration
• when placed in a isotonic solution
• when placed in a solution containing a low pH
• when placed in a solution containing distilled water

What happens to a plant cell when it is placed in a solution with a high water concentration?

• The cell swells up and bursts.

• The cell shrivels up.

• The cell becomes plasmolysed.

• The cell becomes turgid.

Which structure can prevent a plant cell from bursting when it gains water by osmosis?

• Cell membrane

• Cell wall

• Vacuole

What could cause a plant cell to become plasmolysed?

• Gain of water

• Loss of water

• Vacuole swelling up

A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm. What is the best explanation for his observation?

• water was absorbed into the lettuce cells

• water moved into the lettuce cells by osmosis

• salt moved out of the lettuce cells by diffusion

• water moved out of the lettuce cells by osmosis