Here you can get Class 11 Important Questions for Biology based on NCERT Textbook for Class XI. Biology Class 11 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Human Respiration for Class 11 Biology subject.

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F.Y.J.C. Human Respiration
Human Respiration
❖ EXERCISE
1. Describe the human respiratory system.
2. Describe the process of respiration in human being.
3. Describe the histological structure of lungs. OR
Write a note on the histology of lungs.
4. How does transport of O2 and CO2 take place in man? OR
Explain the transport of respiratory gases O2 and CO2 through external respiration.
5. Describe the respiratory disorders.
6. Write Short notes on –
a) Alveoli c) Larynx
b) Trachea d) Silicosis
e) Asbestosis OR
What are occupational lung diseases? Give a few examples of occupational lung
disease.
7. Differentiate between
a) Pharynx and Larynx.
b) Inspiration and Expiration
c) Transport of O2 and Transport CO2
8. Draw well labelled diagrams of
a) Human Respiratory system.
b) Structure of alveoli
9. Name the sound producing organ of human being.
10. In which form, major part of CO2 is transported in the blood.
11. Name any two disorders of respiratory system.
12. Name the structural and functional unit of lungs.
13. Name the energy currency of cell
14. Define respiration. Give the equation to represent the process of respiration.
15. How respiratory organ, blood and the body cells are involved in respiration?
16. Name some organisms where cutaneous respiration takes place.
17. Give an account of respiratory organs from lower organisms to higher organisms.
18. Write a note on gills.
19. Enlist various parts in human respiratory pathway.
20. What is epiglottis?
21. Name the peritoneal covering of the lung.
22. Name the respiratory surface in the human lung.

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F.Y.J.C. Human Respiration
23. What prevents collapsing of our trachea during breathing?
24. Describe the structure of lungs with the help of neat labelled diagram.
25. Write the names of respiratory organs present in human beings.
26. Diffusion of gases occurs in the alveolar region only and not in other parts of
respiratory system why?
27. Describe how exchange of gases takes place in lungs.
28. Distinguish between right and left lungs.
29. Explain the process of inspiration under normal conditions.
30. Name the respiratory muscles of man.
31. Which part of our brain controls breathing?
32. How breathing is regulated? OR
Breathing is controlled by which part of the brain?
33. Name the various events involved in the transport of respiratory gases.
34. Write a note on internal respiration.
35. Write a note on cellular respiration.
36. Differentiate external and internal respiration.
37. Give reasons:
1. Breathing by mouth is harmful. OR
It is desirable to breath only through nose.
2. The lungs are covered by a double layered membrane.
38. How is respiration regulated? OR
Explain the role of neural system in regulation of respiration.
39. Define the following:
i. Tidal Volume (TV) ii. Inspiratory Reserve Volume (IRV)
iii. Expiratory Reserve Volume (ERV) iv. Residual Volume (RV)
v. Vital Capacity
40. What is tidal volume? Find out the tidal volume (approximate value) for a healthy
human in an hour time.
41. State the volume of air remaining in the lungs after a normal breathing.
42. Define vital capacity. What is its significance?
43. Distinguish between IRV and ERV.
44. Write a note on carbon monoxide poisoning.
45. What is asthma?
46. Write a note on emphysema.

3. INFOMATICA ACADEMY CONTACT: 9821131002/9029004242
F.Y.J.C. Human Respiration
❖ MULTIPLE CHOICE QUESTION
1. Coverings of the lungs are called
(A) meninges (B) pleura (C) ciliary lining (D) peritoneum
2. Through which of these parts air never passes during respiration in man?
(A) bronchi (B) diaphragm (C) trachea (D) larynx
3. Most of the O2 is carried in man
(A) in solution form in plasma (C) as bound form to haemoglobin
(B) as bicarbonates (D) as carbamino-haemoglobin
4. Cartilage is absent in
(A) trachea (B) bronchus (C) bronchioles (D) pharynx
5. Diaphragm in mammals is a
(A) cartilaginous structure (C) membranous structure
(B) bony structure (D) muscular structure
6. Respiration takes place in
(A) Golgi body (C) mitochondria
(B) endoplasmic reticulum (D) nucleus
7. Respiration involves
(A) oxidation (C) both (A) & (B)
(B) reduction (D) none of these
8. In man the chief respiratory organs are
(A) Skin (B) Gills (C) Lungs (D) Nostrils
9. In human beings, oxygen carrying respiratory pigment is
(A) haemocyanin (B) haemoglobin (C) chloroquinin (D) haemoerythrin
10. The rate of respiration is controlled in
(A) brain (B) heart (C) both (A) & (B) (D) none of these
11. The mechanism of exchange of 02 is by
(A) diffusion (B) chloride shift (C) both (A) & (B) (D) none of these
12. Alveoli in lungs are internally lined by
(A) cuboidal epithelium (C) squamous epithelium
(B) ciliated epithelium (D) glandular epithelium
13. The steps in breathing are
(A) inspiration and expiration (C) inhalation and inspiration
(B) contraction and relaxation (D) none of these
14. In die tertiary bronchioles the covering does not have
(A) tracheal rings (C) epithelial tissue
(B) connective tissue (D) both (A) & (B)

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F.Y.J.C. Human Respiration
15. On dorsal side cartilagenous rings of trachea are
(A) incomplete (B) complete (C) calcified (D) extra thick
16. The correct sequence of conduction of air in respiratory system is
(A) nasal cavity, pharynx, larynx and bronchi
(B) larynx, trachea, bronchi and nasal cavity
(C) nasal cavity, pharynx, larynx, trachea and bronchi
(D)nasal cavity, larynx, pharynx, trachea and bronchi
17. A dual organ is
(A) trachea (B) bronchus (C) pharynx (D) larynx
18. Nasal chamber is divided into two parts by
(A) Sphenoid (B) Palatine (C) Mesethmoid (D) Zygomatic
19. Adam’s apple is the name given to
(A) pharynx (B) larynx (C) trachea (D) bronchus
20. The left lung is divided into
(A) 3 lobes (B) 2 lobes (C) 4 lobes (D) 6 lobes
21. Glottis is the opening present in between
(A) pharynx and larynx (C) laryngopharynx and larynx
(B) trachea and larynx (D) nasal passage and pharynx
22. Volume of air inspired and expired during normal breathing is called as
(A) respiration (C) tidal volume
(B) vital capacity (D) residual volume
23. Exchange of O2 and CO2 from the blood into tissue takes place through
(A) plasma (B) lymph (C) RBC’s (D) directly
24. The right lung of man is divided into
(A) 2 lobes (B) 3 lobes (C) 4 lobes (D) 5 lobes
25. The tracheal lining is ciliated. Cilia help in
(A) Inspiration (C) pushing mucus out
(B) Expiration (D) pushing mucus in
26. One of the following statements is correct.
(A) Gullet is the opening of trachea in pharynx.
(B) Gullet is the opening of oesophagus in the pharynx.
(C) Glottis is the opening of oesophagus in the pharynx.
(D)Glottis is the opening of Eustachian tube.
27. Cellular respiration occurs in
(A) RBCs (C) cells of the body
(B) alveoli (D) blood vessels

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F.Y.J.C. Human Respiration
28. Transport of CO2 is in the form of
(A) sulphates (B) phosphates (C) carbonates (D) chlorides
29. Transport of O2 is done by
(A) plasma (B) R.B.C (C) lungs (D) nostrils
30. Respiration taking place: in the lungs is called
(A) Internal respiration (C) Cellular respiration
(B) External respiration (D) Tissue respiration
31. In asthma, what causes respiratory distress?
(A) spasm of bronchial muscles.
(B) excessive, thick mucous secretions in the air ways.
(C) inflammation of the mucosa of the respiratory tract.
(D)all of the above.
32. In asthma, the main difficulty is experienced in which phase of respiration?
(A) Inspiration (C) both (A) and (B)
(B) Expiration (D) none of these
33. The factor, not DIRECTLY associated with Asthma is
(A) emotional stress (C) air pollution
(B) strenuous exercises (D) low oxygen pressure as in high altitudes
34. In occupational lung diseases, the pollutants are characterised by
(A) very small size
(B) cause acute inflammation (allergens)
(C) large particle size so as to block the lower airways
(D)can infect by person to person route
35. Silicosis is seen in all industries except
(A) pottery work (C) glass industry
(B) road construction (D) stone mining
36. The minimum exposure for development of Asbestosis is
(A) 10 to 20 years (C) 30 to 40 years
(B) 20 to 30 years (D) 40 to 50 years
37. The most common type of asbestos associated with asbestosis is
(A) pink asbestos (C) white asbestos
(B) blue asbestos (D) none of these

6. INFOMATICA ACADEMY CONTACT: 9821131002/9029004242
F.Y.J.C. Human Respiration
❖ ANSWERS TO MULTIPLE CHOICE QUESTIONS
1.(B) 2.(B) 3.(C) 4.(C) 5.(D) 6.(C) 7.(A) 8.(C)
9.(B) 10.(A) 11.(A) 12.(C) 13.(A) 14.(A) 15.(A) 16.(C)
17.(C) 18.(C) 19.(B) 20.(B) 21.(A) 22.(C) 23.(B) 24.(B)
25.(C) 26.(B) 27.(C) 28.(C) 29.(B) 30.(B) 31.(D) 32.(B)
33.(D) 34.(A) 35.(B) 36.(A) 37.(B)