Chapter Exam

Chapter 6: Respiration — Online MCQ Test

Q: Which structure in the human respiratory system is known as the sound box?

Answer: B. Larynx — The larynx is a cartilaginous box located in the neck that produces sound, hence it is called the sound box.

Q: What is the primary site of gaseous exchange in human lungs?

Answer: B. Alveoli — Alveoli are the thin-walled, sac-like structures where oxygen and carbon dioxide exchange occurs through diffusion.

Q: Carbon dioxide is transported in the blood primarily as:

Answer: C. Bicarbonate ions — About 70% of carbon dioxide is transported as bicarbonate ions in the plasma.

Q: Which statement correctly describes the Hemoglobin-Oxygen Dissociation Curve?

Answer: B. It is sigmoid in shape — The dissociation curve is sigmoidal due to the cooperative binding of oxygen molecules to hemoglobin.

Q: If a person's alveolar pO2 is significantly lower than normal due to high altitude, what is the most immediate compensatory physiological response?

Answer: B. Increase in heart rate and respiratory rate — At high altitudes, lower pO2 triggers the carotid and aortic bodies to signal the brain to increase respiratory rate and heart rate to maintain oxygen delivery.

ZOOLOGY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 6: Respiration with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th ZOOLOGY. This chapter covers: Focusing on respiratory mechanics this chapter details human respiratory organs breathing mechanisms and gas exchange in alveoli. Students examine oxygen carbon dioxide transport r.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Respiration — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th ZOOLOGY — Chapter 6: Respiration, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which structure in the human respiratory system is known as the sound box?

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

Answer: B. Larynx
The larynx is a cartilaginous box located in the neck that produces sound, hence it is called the sound box.

What is the primary site of gaseous exchange in human lungs?

A. Bronchioles
B. Alveoli ✓
C. Trachea
D. Pleura

Answer: B. Alveoli
Alveoli are the thin-walled, sac-like structures where oxygen and carbon dioxide exchange occurs through diffusion.

Carbon dioxide is transported in the blood primarily as:

A. Dissolved gas in plasma
B. Carbaminohemoglobin
C. Bicarbonate ions ✓
D. Carbonic acid

Answer: C. Bicarbonate ions
About 70% of carbon dioxide is transported as bicarbonate ions in the plasma.

Which statement correctly describes the Hemoglobin-Oxygen Dissociation Curve?

A. It is a straight line
B. It is sigmoid in shape ✓
C. It is hyperbolic in shape
D. It is unaffected by pCO2 levels

Answer: B. It is sigmoid in shape
The dissociation curve is sigmoidal due to the cooperative binding of oxygen molecules to hemoglobin.

If a person's alveolar pO2 is significantly lower than normal due to high altitude, what is the most immediate compensatory physiological response?

A. Decrease in ventilation rate
B. Increase in heart rate and respiratory rate ✓
C. Decreased production of hemoglobin
D. Constriction of the bronchioles

Answer: B. Increase in heart rate and respiratory rate
At high altitudes, lower pO2 triggers the carotid and aortic bodies to signal the brain to increase respiratory rate and heart rate to maintain oxygen delivery.