Grade 9 Science Summative Test

What is the main function of the respiratory system?

• Breaks down food

• Circulates blood

• Delivers oxygen and removes carbon dioxide

• Produces hormones

Which organ is primarily responsible for gas exchange?

• Heart

• Kidney

• Lungs

• Brain

Which structure allows air to pass from the throat to the lungs?

• Aorta

• Trachea

• Diaphragm

• Esophagus

Where in the lungs does the exchange of oxygen and carbon dioxide take place?

• Bronchi

• Diaphragm

• Alveoli

• Trachea

What muscle helps the lungs expand and contract during breathing?

• Biceps

• Trapezius

• Diaphragm

• Sternum

What is the major function of the circulatory system?

• Transport nutrients and oxygen

• Control movement

• Filter waste

• Store energy

Which organ pumps blood throughout the body?

• Brain

• Lungs

• Heart

• Liver

What blood vessels carry oxygenated blood away from the heart?

• Veins

• Arteries

• Capillaries

• Bronchi

Which blood component fights against infection?

• Red blood cells

• Platelets

• White blood cells

• Plasma

Which blood cells carry oxygen?

• Platelets

• White blood cells

• Red blood cells

• Plasma