Everyday Science · Body Systems (Human Biology) · page 12 of 12

Respiratory System MCQs with Answers

Includes 10 past paper MCQs (marked).

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Respiratory System MCQs (111–114)

4 MCQs with answers and a short one-liner. Hide answers to test yourself.

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111.
Breathing rate of man is lowest while ?
Correct Answer: B. Sleeping
One-liner
The breathing rate of man is lowest while sleeping because the body's metabolic demand for oxygen is at its minimum during rest.
112.
Which of the following is true for respiration?
Correct Answer: B. Carbon dioxide is produced
One-liner
During respiration, carbon dioxide is produced as a waste product when cells break down glucose to release energy.
113.
How many lungs do humans have?
Correct Answer: B. Two
One-liner
Humans have two lungs — a right lung and a left lung — located in the thoracic cavity.
114.
The trachea is divided into two smaller tubes called?
Correct Answer: C. Bronchial Tubes
One-liner
The trachea divides into two smaller tubes called bronchial tubes (also known as bronchi).