Chapter Exam

Unit 1B: Breathing and Exchange of Gases — Online MCQ Test

Q: Which structure is the primary site of gas exchange in the human respiratory system?

Answer: B. Alveoli — Alveoli have thin walls and a rich capillary network, making them ideal for exchange of oxygen and carbon dioxide.

Q: The normal respiratory rate of a healthy adult at rest is approximately:

Answer: B. 12–16 breaths per minute — A healthy adult normally breathes about 12 to 16 times per minute at rest.

Q: During inspiration, the diaphragm:

Answer: B. Moves downward and flattens — When the diaphragm contracts, it flattens and increases thoracic cavity volume, helping air enter the lungs.

ZOOLOGY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 1B: Breathing and Exchange of Gases with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR ZOOLOGY. This chapter covers: This chapter details human respiratory system structure mechanics of breathing pulmonary volumes capacities gas exchange across alveoli hemoglobin oxygen transport and respiratory.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 1B: Breathing and Exchange of Gases — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR ZOOLOGY — Unit 1B: Breathing and Exchange of Gases, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which structure is the primary site of gas exchange in the human respiratory system?

A. Trachea
B. Alveoli ✓
C. Bronchi
D. Larynx

Answer: B. Alveoli
Alveoli have thin walls and a rich capillary network, making them ideal for exchange of oxygen and carbon dioxide.

The normal respiratory rate of a healthy adult at rest is approximately:

A. 6–8 breaths per minute
B. 12–16 breaths per minute ✓
C. 20–25 breaths per minute
D. 30–35 breaths per minute

Answer: B. 12–16 breaths per minute
A healthy adult normally breathes about 12 to 16 times per minute at rest.

During inspiration, the diaphragm:

A. Moves upward and becomes dome-shaped
B. Moves downward and flattens ✓
C. Remains stationary
D. Contracts and moves the ribs downward

Answer: B. Moves downward and flattens
When the diaphragm contracts, it flattens and increases thoracic cavity volume, helping air enter the lungs.

Which of the following statements about carbon monoxide poisoning is correct?

A. CO binds loosely to haemoglobin and is easily removed
B. CO has a much higher affinity for haemoglobin than oxygen ✓
C. CO increases oxygen carrying capacity of blood
D. CO is converted into oxygen inside RBCs

Answer: B. CO has a much higher affinity for haemoglobin than oxygen
Carbon monoxide binds haemoglobin very strongly, reducing the blood’s oxygen-carrying capacity.

Which of the following is the correct pair of respiratory disorder and its cause?

A. Asthma — irreversible destruction of alveoli
B. Pneumonia — inflammation of alveoli due to infection ✓
C. Occupational respiratory disorder — deficiency of haemoglobin
D. Asphyxia — excessive production of surfactant

Answer: B. Pneumonia — inflammation of alveoli due to infection
Pneumonia is an infection that inflames the alveoli and can fill them with fluid, impairing gas exchange.