NSEB Breathing and Exchanges of Gases Questions with Answers

The chapter on breathing and exchange of gases is one of the most important topics in biology for competitive exams like NSEB. Understanding this topic requires a strong grasp of both theoretical concepts and application-based problem-solving.

Practicing NSEB Breathing and Exchanges of Gases Questions helps students improve their analytical thinking and accuracy. Questions are often conceptual, involving diagrams, physiological processes, and real-life applications. Regular practice of NSEB Respiration Problems with Solutions ensures better retention and exam performance.

Also Read: 

• NSEB syllabus
• NSEB Previous Year Question Papers

Important Topics Covered in NSEB Respiration Questions

Before solving questions, it is essential to understand the core areas from which most questions are asked.

Key topics include:

• Human respiratory system structure

• Mechanism of breathing (inhalation and exhalation)

• Exchange of gases in alveoli and tissues

• Transport of oxygen and carbon dioxide

• Oxygen dissociation curve

• Regulation of respiration

• Respiratory volumes and capacities

NSEB Breathing and Exchange of Gases Questions are based on conceptual clarity from these topics.

NSEB Breathing and Exchange of Gases MCQ Pattern

NSEB Breathing and Exchange of Gases Questions are designed to test deep understanding rather than rote learning.

Typical question types include:

• Concept-based MCQs

• Assertion-Reason questions

• Diagram-based questions

• Match the following

• Case-based questions

In NSEB Respiration Questions, students are often required to apply multiple concepts simultaneously, especially in gas transport and regulation mechanisms.

NSEB Respiration Problems with Solutions: How to Approach

Solving NSEB Respiration Problems with Solutions requires a structured approach:

• First, carefully read the question and identify the concept being tested. Many problems are multi-layered, so understanding the context is crucial.

• Next, recall the relevant concepts such as gas exchange, hemoglobin affinity, or breathing mechanism. Apply logical reasoning instead of guessing.

• For numerical or analytical problems, break them into steps and solve them systematically. Even in MCQs, eliminating incorrect options improves accuracy.

• Finally, review the solution thoroughly to understand mistakes and strengthen weak areas.

NSEB Breathing and Exchanges of Gases Questions and Answers

Here are the NSEB Breathing and Exchanges of Gases Questions and Answers: 

1. During the respiration process ______ has to be continuously provided to the cells and ______ produced by the cells have to be released out.
(A) Oxygen, Nitrogen
(B) Nitrogen, Sulphur
(C) Oxygen, Carbon dioxide
(D) Nitrogen, Carbon dioxide 

Solution: 1. (C)

2. The process of exchange of O2 from the atmosphere with CO2 produced by the cells is called:
(A) Breathing
(B) Inspiration
(C) Respiration
(D) Expiration 

Solution: 2. (A)

3. The process of oxidation of glucose during which CO2, H2O and energy are produced is known as:
(A) Breathing
(B) Inspiration
(C) Respiration
(D) Expiration 

Solution: 3. (C) 

4. Which of the following are the respiratory organs of insects?
(A) Tracheal Tubes
(B) Gills
(C) Cuticle
(D) Lungs 

Solution: 4. (A)

5. Which animal among the following respires via buccal cavity, moist skin and lungs?
(A) Hydra
(B) Frog
(C) Sycon
(D) Earthworm

Solution: 5. (B) 

6. The respiratory organs used in pulmonary respiration-
(A) Gills
(B) Lungs
(C) Cuticle
(D) Tracheal tubes 

Solution: 6. (B) 

7. Cutaneous respiration takes place through-
(A) Gills
(B) Lungs
(C) Spiracle
(D) Skin 

Solution: 7. (D)

8. Which group of animals respire through lungs?
(A) Earthworm and insects
(B) Sponges, coelenterates and flatworms
(C) Fishes and aquatic arthropods
(D) Amphibians, reptiles, birds and mammals 

Solution: 8. (D)

9. Book lungs are respiratory structures present in-
(A) Scorpion
(B) Mollusca
(C) Mammals
(D) Earthworm 

Solution: 9. (A)

10. Among vertebrates, ____A____ use gills whereas reptiles, birds and mammals respire through the ____B____ Amphibians like frogs can respire through ____C____ also . 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

Solution: 10. (C)

11. At which level of thoracic vertebrae, trachea divides- 

(A) 2 nd thoracic vertebra 

(B) 5 th thoracic vertebra 

(C) 3 rd thoracic vertebra 

(D) 4 th thoracic vertebra 

Solution: 11. (B)

12. Trachea divides into right and left- 

(A) Secondary bronchi 

(B) Tertiary bronchi 

(C) Bronchioles 

(D) Primary bronchi 

Solution: 12. (D)

13. Which membrane covers the lungs and provide protection? 

(A) Pericardium 

(B) Renal capsule 

(C) Pleura 

(D) Epineurium 

Solution: 13. (C)

14. Which is the correct sequence of air passage in man? 

(A) External nostril → Nasal passage → Internal nostril → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli 

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

(C) Nose → Pharynx → Larynx → Bronchioles → Bronchi → Alveoli 

(D) Nose → Bronchioles → Pharynx → Larynx → Bronchi → Alveoli 

Solution: 14. (A) 

15. Incomplete cartilaginous rings support all of the following except 

(A) Trachea 

(B) Primary, secondary and tertiary bronchi 

(C) Respiratory bronchioles 

(D) Initial bronchioles

Solution: 15. (C) 

16. Read the following features: 

i. It is double layered and covers the lungs 

ii. Fluid between the layers reduces friction on lung surface 

iii. Outer layer is in contact with thoracic wall 

iv. Inner layer is in contact with lungs 

 The following features refer to- 

(A) Pericardium 

(B) Peritoneum 

(C) Pleura 

(D) None of the above 

Solution: 16. (C)

17. The thoracic chamber is formed dorsally by the ____A____, ventrally by the ____B____ laterally by the ____C____ and on lower side by the domeshaped ____D____ . 

Select the right choices for A, B, C and D to complete the given statement. 

(A) A-vertebral column, B-sternum, C-ribs, Ddiaphragm 

(B) A-vertebral column, B-ribs, C-sternum, Ddiaphragm 

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

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

Solution: 17. (A)

18. Diffusion membrane consists of: 

(A) Squamous epithelium of alveoli 

(B) Endothelium of alveolar capillaries 

(C) Basement substance between them 

(D) All of the above 

Solution: 18. (D)

19. During inspiration, the volume of thoracic cavity increases because of- 

(A) Contraction of diaphragm and external intercostal muscles 

(B) Relaxation of diaphragm and external intercostal muscles 

(C) Contraction of diaphragm and relaxation of external inter-costal muscles 

(D) Relaxation of diaphragm and contraction of external inter-costal muscles

Solution: 19. (A)

20. Expiration occurs due to- 

(A) Relaxation of diaphragm and external intercostal muscle 

(B) Contraction of internal intercostal muscles and diaphragm 

(C) Relaxation of abdominal and internal intercostal muscles 

(D) Contraction of diaphragm and relaxation of abdominal muscles 

Solution: 20. (A)

 21. What happens to the volume of pulmonary cavity when there is an increase in the volume of thoracic chamber? 

(A) It decreases 

(B) It increases 

(C) It remains same 

(D) First decreases and then increases

Solution: 21. (B)

Preparation Tips for NSEB Breathing and Exchanges of Gases

To perform well in this topic, students should follow a focused preparation strategy.

Start by building strong conceptual clarity from NCERT and standard biology references. This chapter is highly conceptual, so understanding processes is more important than memorization.

Practice a variety of NSEB Respiration Questions regularly. Focus on MCQs and previous year questions to understand the exam pattern.

Revise diagrams such as the human respiratory system and alveolar structure, as visual questions are common.

Maintain a notebook of mistakes while solving NSEB Breathing and Exchange of Gases Questions with answers. Revising these mistakes helps avoid repetition.

Lastly, take timed practice tests to improve speed and accuracy, which are crucial for NSEB.