Osmosis

If a substance can pass through a membrane it is said to be

If a substance cannot pass through a membrane the membrane is said to be

If a membrane will allow some but not all substances to pass through it then the membrane is said to be

Why does freshly baked bread smell stronger than stale bread?

• Diffusion (the freshly baked bread is warmer so the molecules responsible for smell have more energy provided to them allowing faster movements)

• Osmosis (the freshly baked bread is warmer so the molecules responsible for smell have more energy provided to them allowing faster movements)

Osmosis is defined as the movement of water molecules across a semi-permeable membrane from a region of

• Low water concentration to high water concentration

• High water concentration to low water concentration

• High solute concentration to low solute concentration

• A region of negative charge to a region of positive charge.

Diffusion is defined as the spreading out of molecules from a region of high concentration to a region of low concentration across a semi permeable membrane.

• True

• False

A red blood cell that has shrivelled up due to being placed in a very concentrated solution is said to be:

• plasmolysed

• Crenated

• Turgid

• Isotonic

When two solutions have the same concentration they are said to be

• hypotonic

• hypertonic

• isotonic

A plant cell that has been placed in a solution of high water concentration will swell slightly. This is because the vacuole inside the cell wall swells up and presses up against the cell wall. This is known as:

• Plasmolysis

• Turgor

• Crenation

• Sunburn

When a plant cell is placed in a solution that is highly concentrated in terms of the amount of solute present, the vacuole and the cytoplasm shrivel and the cell moves away from the cell wall. This is known as...

• Plasmolysis

• Crenation

• Turgor Pressure

• Osmoregulation