CIE Science 7B 1.1-1.2 Formative Assessment

Which of the following is NOT a part of the human respiratory system? (2 points)

• lungs

• heart

• trachea

• bronchi

What is the main function of the alveoli in the lungs? (2 points)

• To filter air

• To warm air

• To exchange gases

• To store air

Why is the trachea (windpipe) lined with cilia and mucus? (2 points)

• To help warm and humidify air

• To prevent dust and particles from entering the lungs

• To aid in gas exchange

• To support the trachea

What is the role of the diaphragm in breathing? (2 points)

• To filter air

•  To control the flow of air

• To help expand and contract the chest cavity

• To exchange gases

Which is the process of taking in oxygen and releasing carbon dioxide? (2 points)

• Breathing

• Respiration

• Circulation

• Digestion

What is the main difference between breathing and respiration? (2 points)

• Breathing is the mechanical process, while respiration is the chemical process.

• Breathing is the chemical process, while respiration is the mechanical process.

• Both are the same process.

• Neither is related to gas exchange.

What gas makes up the majority of clean, dry air? (2 points)

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

Which gas is essential for human life and is found in a small percentage in the atmosphere? (2 points)

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

Answer explanation

Oxygen is essential for human life and is found in a small percentage in the atmosphere.

While nitrogen makes up the majority of the atmosphere, oxygen is the gas that our bodies need to breathe and survive.

What gas is produced as a waste product of respiration? (2 points)

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

Answer explanation

Carbon dioxide is produced as a waste product of respiration.

Which of the following is NOT a component of clean, dry air? (2 points)

• Water vapor

• Nitrogen

• Argon

• Carbon dioxide

Answer explanation

The basic composition of clean, dry air includes 78.1% nitrogen, 21.0% oxygen, 0.9% argon, and 0.04% carbon dioxide. Other gases like neon and helium are present in trace amounts. Water vapor is typically excluded in this definition.