Respiratory organs — NEET Biology Questions

Practice 35 questions on Respiratory organs from Breathing and Gaseous Exchange (NCERT Class 11, Chapter 14). Free samples below — get all 35 in the app.

35 Questions Breathing and Gaseous Exchange Class 11

Sample Questions — Respiratory organs

Try 5 questions below from Respiratory organs. Get all 35 in the MedicNEET app.

MCQ
Why are alveoli considered the site of actual respiration?
  • A. Because they are closest to heart
  • B. They have high surface area and thin walls
  • C. They contain mucus
  • D. They are muscular
✅ Correct Answer: B
Alveoli are the exchange surface due to their structure and capillary network.
MCQ
Assertion (A): The conducting part of the respiratory system conditions the air. Reason (R): It helps in sound production and excretion.
  • A. Both A and R are true and R is the correct explanation of A
  • B. Both A and R are true but R is not the correct explanation of A
  • C. A is true but R is false
  • D. A is false but R is true
✅ Correct Answer: C
The conducting part humidifies, warms, and filters air—not involved in sound production or excretion.
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MCQ
Identify the INCORRECT pair:
  • A. Bronchi – Supported by cartilaginous rings
  • B. Alveoli – Exchange of gases
  • C. Pleural fluid – Increases friction
  • D. Diaphragm – Forms lower boundary of thorax
✅ Correct Answer: C
Pleural fluid reduces friction on the lung surface during breathing.
MCQ
Why do frogs respire through skin despite having lungs?
  • A. Because lungs are vestigial in frogs
  • B. Because skin provides immunity
  • C. For osmoregulation
  • D. For cutaneous respiration during aquatic life
✅ Correct Answer: D
Frogs can respire through their moist skin (cutaneous respiration), especially in water.
MCQ
The human trachea divides at the level of which thoracic vertebra?
  • A. 5th
  • B. 2nd
  • C. 7th
  • D. 10th
✅ Correct Answer: A
Trachea divides at the level of the 5th thoracic vertebra into primary bronchi.

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