1.Oxygen is utilized by an organism to

(A) directly breakdown the nutrient molecules

(B) indirectly breakdown the nutrient molecules

(C) obtain nourishment from the food

(D) burn the organic compounds indirectly

2. Process of exchange of 2 O from the atmosphere with…A… produced by the cells is called …B…, which is commonly known as …C… Choose appropriate options for the blanks A, B and C to complete the given statement.

(A) A — 2 H O, B—breathing, C—respiration

(B) A— 2 O, B-breathing, C—respiration

(C) A— 2 CO, B-breathing, C—respiration

(D) A—N 2 O, B-breathing, C—respiration

3. Among vertebrates,…A… use gills whereas reptiles, birds and mammals respire through the …B… Amphibians like frogs can respire through…C… also. Mammals have a well adapted respiratory system. Select appropriate choice for the blanks A, B and C to complete the given statement.

(A) A-fishes, B-lungs, C-gills

(B) A-fishes, B-lungs, C-dry skin

(C) A-fishes, B-lungs, C-moist skin

(D) A-mammals, B-gills, C-moist skin

4. Correct sequence of the air passage in humans is

(A) Nose → Larynx → Pharynx → Bronchioles→Alveoli

(B) Nose → Pharynx→ Larynx → Bronchioles →Bronchi

(C)Nose → Pharynx → Larynx → Bronchioles → Trachea

(D) External nostril→Nasal passage→Internal nostril→ Pharynx→Larynx→Trachea→Bronchi→Bronchiole →Alveoli

5. During swallowing, glottis can be covered by a thin elastic cartilaginous flap called …A…to prevent the entry of food into larynx. Trachea is it straight tube extending up to …B…cavity. which then divides into right and left primary …C… Choose the correct option for .A, B and C from the given four options to complete the above statement.

(A) A→epiglottis, B →bronchi, C→bronchioles

(B) A→epiglottis, B→ mid thoracic, C→bronchi

(C) A→epiglottis, B→hind thoracic, C→bronchi

(D) A→epiglottis, B→prethoracic, C→bronchioles

6. At which thoracic vertebra does trachea divide into right and left primary bronchi?

(A) 5 (B) 6 (C) 9 (D) 4

7. Nasopharynx opens through the …A… of the larynx region into the …B… Choose the correct option for A and B to complete the given statement.

(a) A-trachea. B-lungs

(b) A-trachea, B-glottis

(c) A-glottis. lungs

(d) A-glottis. B-trachea

8. Which of the following statement is incorrect about nasopharynx?

(A) Internal nostrils opens into nasopharynx

(B) It is the common passage for air only

(C) It is a portion of pharynx

(D) Nasopharynx opens through the glottis of the larynx region into the trachea

9.Larynx is present in between

(A) epiglottis and glottis

(B) trachea and bronchiole

(C) epiglottis and trachea

(D) bronchus and epiglottis

10. Which portion of the human respiratory system is called sound box?

(A) Larynx (B) Trachea (C) Nasopharynx (D) Glottis

11. Friction on the lungs surface is reduced by?

(A) double layered pleura

(B) single layered pleura

(C) epiglottis upto trachea

(D) mucous membrane surrounding the lungs

12. Conducting part of the respiratory system comprises

(A) external nostrils unto the terminal bronchioles

(B) internal nostrils upto trachea (

C) epiglottis upto trachea

(D) larynx upto bronchi

13. Respiratory or exchange part of the respiratory system comprises

(A) lungs and pleural membrane

(B) alveoli and their ducts

(C) bronchus and their protecting covering

(D) diaphragm and alveoli

14. Which of the following statement is false?

(A) The conducting part of the respiratory system transports the atmospheric air to alveoli

(B) Conducting part of the respiratory system clears the from foreign particles, humidifies and brings it the body temperature

(C) Exchange part of the respiratory system is the actual site at which 2 O and 2 COexchange takes place

(D) None of the above

15. The thoracic chamber is formed dorsally by the …A…, ventrally by the …B… laterally by the …C… and on lower side by the dome-shaped …D… Select the right choices for A, B, C and D to complete the given statement.

(A) A-vertebral column, B-sternum, C-ribs, D-diaphragm

(B) A-vertebral column, B-ribs, C-sternum, D-diaphragm

(C) A-diaphragm, B-ribs, C -sternum, D -vertebral column

(D) A-ribs, B-diaphragm, C-sternum. D-vertebral column

18. How many layers are present in the diffusion membrane of alveolus capillary?

(A) 5 (B) 3 (C) 2 (D) 4

19. Diffusion membrane is made up of

(A) thin squamous epithelium of alveoli

(B) endothelium of alveolar capillaries

(C) basement substance in between the two mentioned above

(D) All of the above

21. Identify which respiratory structure possesses the following features and choose the correct option accordingly.

(A) Found in mammals (B) Highly muscular and fibrous partition, elevated towards the thorax like a dome (C) Separates thoracic and abdominal cavity.
(a) Pleural membrane (b) Phrenic muscle (c) Diaphragm (d) Mediastinum

23. Respiration in insects is called direct because

(A) the cells exchange 2 O/ 2 COdirectly with the air in the tubes (B) the tissues exchange 2 O/ 2 CO directly with coelomic fluid (C) the tissues exchange 2 O/ 2 CO directly with the air outside
D) tracheal tubes exchange 2 O / 2 CO directly with the haemocoel which then exchange with tissues

24. Regarding the function of our respiratory system, mark the wrong entry?

(A) Brings the air to body temperature

(B) Warms up the air

(C) Diffusion of gases

(D) Cleans up the air

25. A person suffers punctures in his chest cavity in an accident, without any damage to the lungs its effect could be

(A) reduced breathing rate

(B) rapid increase in breathing rate

(C) no change in respiration

(D)cessation in breathing


1. (B) 2. (C) 3. (C) 4. (D) 5. (A) 6. (A) 7. (D) 8. (D) 9. (C) 10. (A) 11. (A) 12. (A) 13. (B) 14. (A) 15. (A) 18. (B) 19. (D) 21. (C) 23. (A) 24. (D) 25. (D)

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