NT Science Breathing

The difference between exhaled air and inhaled air is

• inhaled air has only oxygen and exhaled air has only carbon dioxide

• inhaled air has only carbon dioxide and exhaled air contains only oxygen

• inhaled air has more carbon dioxide than exhaled air

• inhaled air has less carbon dioxide than exhaled air

Exhaled air has more water vapour than inhaled air because

• the air sacs in our lungs contain moisture

• carbon dioxide is wet

• of the acid in our stomach

How do we test for the presence of carbon dioxide?

• breathe onto blue litmus paper, blue litmus paper turns red

• bubble carbon dioxide into limewater; limewater turns cloudy

• bubble carbon dioxide into hydrochloric acid; it will turn red

• breathe carbon dioxide onto lighted splint, it will glow red

Cobalt chloride paper can be used to test for presence of water vapour. What will be the change in the cobalt chloride paper when there is water vapour?

• It will change from blue to red

• It will change from blue to pink

• It will change from green to yellow.

• It will change from yellow to green.

Breathing can be described as

• taking in oxygen and giving out carbon dioxide

• taking in carbon dioxide and giving out oxygen

• taking in air with more carbon dioxide and giving out air with more oxygen

• taking in air with more oxygen and giving out air with more carbon dioxide

What is the name of the part labelled B?

• bronchus

• windpipe

• lung

• air sacs

What is the function of the part labelled D?

• to pump the blood around the body

• to digest proteins

• to exchange gases: oxygen goes into the bloodstream and carbon dioxide goes out of the bloodstream to be exhaled

• to protect the lungs and heart

How does the diaphragm move when we breathe out?

• upwards

• downwards

• sideways