Movement In and Out of Cells

The arrows in the diagram show the movement of oxygen and carbon dioxide between body cells and the blood in capillaries.

By which process does this movement occur?

• diffusion

• excretion

• osmosis

• respiration

The diagram shows the apparatus used in an experiment on osmosis.

In which tubes will osmosis take place?

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

What is an example of osmosis?

• Carbon dioxide goes out through the stomata of a leaf.

• Digested food is absorbed from the small intestine.

• Oxygen goes into the blood from an alveolus.

• Water enters a plant root from the soil.

The diagram shows an experiment to demonstrate the movement of molecules.

After one hour, the water in the beaker turned red.

What is the most likely reason for this colour change?

• Molecules of red ink move through the membrane by diffusion

• Molecules of red ink move through the membrane by osmosis.

• Molecules of water move through the membrane by diffusion.

• Molecules of water move through the membrane by osmosis

Why does oxygen diffuse into the blood from an alveolus in the lungs?

• The oxygen concentration in the alveolus is greater than the carbon dioxide concentration in the blood.

• The oxygen concentration in the alveolus is greater than in the blood.

• The oxygen concentration in the blood is greater than in the alveolus.

• The oxygen concentration in the blood is greater than the carbon dioxide concentration in the alveolus.

Which diagram shows the changes in appearance of a plant cell when it remains in a concentrated sugar solution for thirty minutes?

• A

• B

• C

• D

• A

• B

• C

• D

A student cuts out four pieces of carrot root of equal size. The pieces are treated as shown in the diagram, and then left for two hours.

After two hours, which piece of carrot will be the smallest?

• A

• B

• C

• D

The diagrams show how a cell appears under the microscope at the start of an experiment and after it has been placed in a dilute solution of salts for 5 minutes.

Which statement explains what happens?

• Dissolved salts enter the cell by diffusion.

• Dissolved salts leave the cell by diffusion.

• Water enters the cell by osmosis.

• Water leaves the cell by osmosis.

• A

• B

• C

• D