Complete Exam Guide Subject-wise practice platform
Breathing and Exchange of Gases

The Human Respiratory System Practice Questions

20 free The Human Respiratory System practice questions for the NCERT Biology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

Start Practice Quiz

Questions

All The Human Respiratory System questions

20 questions
  1. Q1. Which of the following structures is known as the 'sound box' and helps in sound production?
  2. Q2. The trachea divides into two primary bronchi at the level of which thoracic vertebra?
  3. Q3. Which of the following structures in the respiratory system are supported by incomplete cartilaginous rings?
  4. Q4. What is the primary function of the 'conducting part' of the respiratory system?
  5. Q5. The lungs are situated in an anatomically air-tight chamber known as the:
  6. Q6. Which membrane covers the lungs and reduces friction on the lung-surface?
  7. Q7. Which of the following represents the actual diffusion site of oxygen and carbon dioxide between blood and atmospheric air?
  8. Q8. The thoracic chamber is formed dorsally by the ________ and ventrally by the ________.
  9. Q9. Inspiration can occur if the intra-pulmonary pressure is:
  10. Q10. Which of the following muscles are primarily involved in generating pressure gradients during normal quiet breathing?
  11. Q11. The volume of air inspired or expired during a normal respiration is called:
  12. Q12. Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a forced inspiration. It includes:
  13. Q13. Which of the following is NOT part of the 'respiratory membrane' through which diffusion of gases occurs?
  14. Q14. The solubility of $CO_2$ is ________ times higher than that of $O_2$ across the diffusion membrane.
  15. Q15. The partial pressure of oxygen ($pO_2$) in the alveolar air and deoxygenated blood is respectively:
  16. Q16. The 'Pneumotaxic center' which can moderate the functions of the respiratory rhythm center is located in:
  17. Q17. What is the volume of air that remains in the lungs even after a forcible expiration?
  18. Q18. Vital Capacity (VC) can be defined as:
  19. Q19. During expiration, the diaphragm and external intercostal muscles ________, and the diaphragm becomes ________.
  20. Q20. Which of the following is an occupational respiratory disorder characterized by inflammation and leading to fibrosis (proliferation of fibrous tissues)?