NEET Class 11 Biology - Breathing and Exchange of Gases Chapter: Important Questions
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This document is a valuable resource tailored for NEET (National Eligibility cum Entrance Test) exam preparation, specifically focusing on the "Breathing and Exchange of Gases" chapter from Class 11 Biology NCERT. It encompasses a curated set of crucial questions designed to enhance understanding a...
prACtiCe Questions
Respiratory Organs
1. The process of exchange of O2 from the atmosphere with CO2 produced by the cell is called
(a) Cellular respiration (b) Breathing
(c) Ventilation (d) Perfusion
2. The harmful gas produced by catabolic reaction in our body is
(a) Oxygen (b) Carbon dioxide
(c) Phosphine (d) Ozone
3. Oxygen (O2) is utilized by the organisms to __________ break down nutrient molecules like
glucose and to derive energy for performing various activities.
(a) Directly (b) Indirectly (c) Incompletely (d) Any of these
4. Mechanisms of breathing vary among different groups of animals depending mainly on their
________ and _________.
(a) Habitats (b) Levels of organization
(c) Both (a) and (b) (d) None of these
Exchange of Gases
5. In which of the following, gaseous exchange between O2 and CO2 occurs through the entire
body surface?
(a) Sponges (b) Flatworms (c) Coelenterates (d) All of these
6. Select the total number of organism from the following which respire through their body surface.
Sycon, Spongilla, Admsia, Taenia, Laccifer, Pila, Antedon, Gorgonia, Jelly fish
(a) 4 (b) 5 (c) 6 (d) 8
7. In which of the following skin serves as an accessory organ of respiration?
(a) Rabbit (b) Frog (c) Lizards (d) Birds
8. Match the following:
Animals Respiratory Organs
A. Earthworms – 1. Lungs
B. Aquatic arthropods/Molluscs – 2. Tracheal tubes
C. Insects – 3. Gills
D. Birds/ Reptiles/Mammals – 4. Moist cuticle
E. Fishes
,17.2 Breathing and Exchange of Gases
(a) A–2, B and C–3, D–2, E–1 (b) A–4, B and E–3, C–2, D–1
(c) A–4, B and D–3, D–1, E–2 (d) A–3, B and D–1, C–2, E–4
9. Amphibians, e.g., frogs respire through
(a) Moist skin (b) Lungs
(c) Buccopharyngeal cavity (d) All of these
10. The adult frog does not respire through
(a) Buccopharyngeal cavity (b) Gills
(c) Skin (d) Lungs
11. Which is the correct sequence of the air passage in man?
(a) Nasal cavity → pharynx → trachea → larynx → bronchi → bronchioles → alveoli
(b) Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveoli
(c) Nasal cavity → larynx → pharynx → trachea → bronchi → bronchioles → alveoli
(d) Nasal cavity → larynx → bronchi → pharynx → trachea → bronchioles → alveoli
12. In mammals, voice is produced by
(a) Bronchus (b) Syrinx
(c) Larynx (d) Inhalation and exhalation
13. Vocal cords occur in
(a) Pharynx (b) Larynx
(c) Glottis (d) Bronchial tube
14. Trachea divides into right and left primary bronchi at _________ the thoracic vertebra.
(a) 4 (b) 5 (c) 6 (d) 9
15. Opening of larynx into pharynx is guarded by
(a) Syrinx (b) Epiglottis (c) Tracheal valves (d) All of these
16. Glottis is a passage for
(a) Food (b) air
(c) Both (a) and (b) (d) None of these
17. Glottis is an opening in the floor of
(a) Mouth (b) Trachea (c) Pharynx (d) Diaphragm
18. The Lungs are protected with the help of?
(a) Ribs (b) Vertebral column
(c) Sternum (d) All of these
19. Which one has the smallest diameter?
(a) Right bronchus (b) Left bronchus
(c) Secondary bronchiole (d) Respiratory bronchiole
20. Lining of trachea is made of
(a) Simple squamous epithelium (b) Simple cuboidal epithelium
(c) Pseudostratified epithelium (d) Stratified cuboidal epithelium
21. Each terminal bronchiole gives rise to a number of very thin, irregular walled and vascularized
bag like structures called
(a) Alveoli (b) Respiratory bronchioles
(c) Pleura (d) Follicles
, Breathing and Exchange of Gases17.3
22. Epiglottis is made up of
(a) Fibrous cartilage (b) Hyaline cartilage
(c) Elastic cartilage (d) Calcified cartilage
23. Covering of the lungs is called
(a) Perichondrium (b) Pleural membrane
(c) Pericardium (d) Peritoneum
24. Read the following statements:
A. It is double layered and covers the lungs.
B. Outer layer is in contact with thoracic wall.
C. Fluid is present between these layers.
D. Inner layer is in contact with the lungs.
The above features refer to
(a) Pericardium (b) Peritoneum
(c) Perichondrium (d) Pleura
25. The part starting with the external nostrils up to the terminal bronchioles constitute the
(a) Respiratory part of respiratory system (b) Exchange part of respiratory system
(c) Expiratory part (d) Conducting part of respiratory system
26. Respiratory or exchange part of the respiratory system consists of
(a) All bronchi
(b) All bronchioles
(c) All bronchi and terminal bronchioles
(d) Alveoli and their ducts
27. Sites of gaseous exchange in lungs are
(a) Alveoli (b) Bronchi (c) Bronchioles (d) Pleura
28. Pleura is a double membrane sac which envelops
(a) Kidneys (b) Brain (c) Lungs (d) Nasal passage
29. Which of the following are functions of conducting part of the respiratory system?
(a) Removal of foreign particles from incoming air.
(b) Humidifies incoming air
(c) Bring the temperature of incoming air to body temperature.
(d) All the above
30. ___________ is the site of actual diffusion of O2 and CO2 between blood and atmospheric air.
(a) All bronchi
(b) All bronchioles
(c) All bronchi and terminal bronchioles
(d) Alveoli and their ducts
31. Even when air being absent, the human trachea does not collapse due to the presence of
(a) Bony rings (b) Turgid pressure
(c) Chitinous rings (d) Cartilaginous rings
32. The chambers formed dorsally by the vertebral column, ventrally by sternum, laterally by ribs
and on the lower side by dome-shaped diaphragm is
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