EASE 3 Science Grade 7 Quiz

The following model represents breathing movements. What will happen if a student pulls the plugger down?

• The ballon expands because air goes in.

• The ballon stays the same because air goes in.

• The ballon expands because air goes out.

• The ballon gets smaller because air goes out.

When the diaphragm relaxes, how do the volume and pressure inside the thorax change?

• volume decreases, pressure increases

• volume increases, pressure increases

• volume increases, pressure decreases

• volume decreases, pressure decreases

The diagram shows model for juman breathing system. Which part of the model represents the bronchus?

• plastic bottle

• tubing

• ballon

• rubber sheet

What is the name of the movement of the oxygen molecules from the air sacs into the blood capillaries?

• Diffusion

• Respiration

• Breathing

• Circulation

Which characteristic of red blood cells allow them to get through narrow blood vessels?

• Lack of nucleus

• Contain haemoglobin

• Small and flexible

• Biconcave disk shape

Which of the following equations is for aerobic respiration?

• water + oxygen --> glucose + carbon dioxide

• oxygen + water --> glucose + carbon dioxide

• oxygen + glucose --> carbon dioxide + water

• water + glucose --> oxygen + carbon dioxide

The diagram below shows human blood cells as observed under the microscope. What is the function of the cell labelled X?

• Transport oxygen to all part of body

• Help to defend us against pathogens

• Carries carbon dioxide away from the cells

• Help the process of healing wounds

Which of the following statements is true about the diffusion during gas exchange in the lungs?

• The oxygen molecules move from the capilary to the alveolus

• The oxygen molecules move from the alveolus to the capilary

• The carbon dioxide molecules move from the capilary to the artery

• The carbon dioxide molecules move from the alveolus to the capilary

Which component transports oxygen throughout the body?

• A

• B

• C

• D

Which property of alveolus helps oxygen to move into the blood easily?

• The inner surface of the alveolus is dry.

• The alveolus wall is made of a thin layer of cells.

• The capilary wall is made of a thick layer of cells.

• The inner surface of the alveolus is very small.