Biology Respiration Online Mcqs Test

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Question 1

1. Which gas diffuses from the alveoli into the blood?

Answer

Carbon dioxide

Question 2

2. What is tidal volume?

Answer

Air exchanged in a normal breath

Answer

Volume of oxygen in blood

Answer

Air remaining after exhalation

Answer

Maximum air that can be exhaled

Question 3

3. Which muscle is primarily responsible for breathing?

Answer

Abdominal muscle

Answer

Intercostal muscle

Answer

Pectoral muscle

Question 4

4. What is the main function of the trachea?

Answer

Trap carbon dioxide

Answer

Site of gas exchange

Answer

Filter and moisten air

Answer

Transport air to bronchi

Question 5

5. What is the term for the movement of air into and out of the lungs?

Answer

Ventilation

Answer

Exhalation

Answer

Inhalation

Answer

Respiration

Question 6

6. Which condition is commonly caused by long-term smoking?

Answer

Lung cancer

Question 7

7. What part of the respiratory system divides into left and right branches?

Answer

Nasal cavity

Question 8

8. What is the function of the bronchioles?

Answer

Transport air to alveoli

Answer

Exchange gases

Answer

Filter blood

Answer

Produce mucus

Question 9

9. Which organ system works closely with the respiratory system for gas transport?

Answer

Circulatory system

Answer

Nervous system

Answer

Digestive system

Answer

Excretory system

Question 10

10. What is the main cause of reduced oxygen uptake in smokers?

Answer

High carbon dioxide levels in blood

Answer

Less physical activity

Answer

Weakened diaphragm

Answer

Damaged alveoli and reduced surface area

Question 11

11. How does carbon monoxide from cigarette smoke affect oxygen transport?

Answer

Dissolves in plasma

Answer

Binds with hemoglobin, reducing oxygen transport

Answer

Enhances oxygen binding

Answer

Destroys red blood cells

Question 12

12. What effect does smoking have on cilia in the respiratory tract?

Answer

Paralyzes or destroys them

Answer

Increases their activity

Answer

Strengthens their movement

Answer

Has no effect

Question 13

13. What is the correct sequence of airflow during inhalation?

Answer

Mouth → Bronchi → Larynx → Trachea → Alveoli

Answer

Nose → Trachea → Larynx → Bronchi → Alveoli

Answer

Nose → Larynx → Trachea → Bronchi → Alveoli

Answer

Nose → Bronchi → Trachea → Alveoli

Question 14

14. Which disease is strongly linked to both active and passive smoking?

Answer

Tuberculosis

Answer

Lung cancer

Question 15

15. Which gas is transported from the blood to the alveoli to be exhaled?

Answer

Carbon dioxide

Question 16

16. Which term refers to the maximum amount of air exhaled after a deep breath?

Answer

Tidal volume

Answer

Inspiratory reserve volume

Answer

Vital capacity

Answer

Residual volume

Question 17

17. Which respiratory disease involves inflammation and narrowing of airways?

Answer

Bronchitis

Question 18

18. Which of the following is an early symptom of lung damage due to smoking?

Answer

Joint pain

Answer

High blood sugar

Answer

Chronic cough

Question 19

19. What happens to the air pressure in lungs during inhalation?

Answer

Decreases below atmospheric pressure

Answer

Increases above atmospheric pressure

Answer

Matches atmospheric pressure

Answer

Stays constant

Question 20

20. Which part of the lungs are damaged in emphysema?

Question 21

21. Which organ is directly responsible for breathing?

Question 22

22. How does smoking affect lung alveoli?

Answer

Destroys them over time

Answer

Cleans them

Answer

Increases their number

Answer

Strengthens their walls

Question 23

23. Which of the following best describes exhalation?

Answer

Active contraction of diaphragm

Answer

Sudden air intake

Answer

Absorption of oxygen

Answer

Passive process involving muscle relaxation

Question 24

24. What is the medical term for breathing?

Answer

Ventilation

Answer

Circulation

Answer

Inhalation

Answer

Respiration

Question 25

25. How does smoking contribute to chronic bronchitis?

Answer

Irritates bronchi and causes long-term inflammation

Answer

Reduces blood flow

Answer

Increases lung elasticity

Answer

Strengthens immune system

Question 26

26. Which of the following best explains why athletes often have better lung capacity?

Answer

Higher red blood cell count

Answer

Frequent use of inhalers

Answer

Improved ventilation and alveolar efficiency

Answer

Stronger heart

Question 27

27. What is the primary function of the respiratory system?

Answer

Regulate temperature

Answer

Exchange gases

Answer

Filter blood

Answer

Produce energy

Question 28

28. What is the main reason for coughing in smokers?

Answer

Low immunity

Answer

Damaged cilia and excess mucus

Answer

Lung expansion

Question 29

29. Which of the following is a major component of cigarette smoke that damages lung tissue?

Answer

Carbon monoxide

Answer

Water vapor

Question 30

30. Which structure prevents food from entering the trachea?

Answer

Epiglottis

Question 31

31. Which part of the respiratory system acts as a resonating chamber for voice?

Answer

Nasal cavity

Question 32

32. What is the role of hemoglobin in respiration?

Answer

Transports oxygen in the blood

Answer

Filters oxygen

Answer

Traps bacteria

Answer

Produces enzymes

Question 33

33. What structure branches into bronchi?

Question 34

34. What is the function of intercostal muscles?

Answer

Move ribs during breathing

Answer

Help in heart contractions

Answer

Filter air

Answer

Produce mucus

Question 35

35. During inhalation, what happens to the diaphragm?

Answer

Expands sideways

Answer

Relaxes and moves upward

Answer

Contracts and moves downward

Answer

Contracts and moves upward

Question 36

36. Which part of the brain controls breathing?

Answer

Cerebellum

Answer

Hypothalamus

Answer

Medulla oblongata

Question 37

37. What surrounds the alveoli to facilitate gas exchange?

Answer

Capillaries

Answer

Bronchioles

Question 38

38. Which of the following structures is the main site of gas exchange in the lungs?

Answer

Bronchioles

Question 39

39. Which part of the respiratory system contains vocal cords?

Question 40

40. What happens to the chest cavity during exhalation?

Answer

Contracts and volume decreases

Answer

Expands more

Answer

Remains unchanged

Answer

Becomes larger

Question 41

41. Which process uses oxygen to produce energy in body cells?

Answer

Photosynthesis

Answer

Cellular respiration

Question 42

42. Which process moves oxygen from lungs to blood?

Answer

Active transport

Answer

Filtration

Question 43

43. How does the body primarily detect the need to breathe faster?

Answer

Low heart rate

Answer

High nitrogen levels

Answer

Rising carbon dioxide levels in blood

Answer

Low oxygen levels in muscles

Question 44

44. Which of the following respiratory structures is shared with the digestive system?

Answer

Nasal cavity

Question 45

45. Which of the following is true about lung cancer?

Answer

It is caused by bacteria

Answer

It cannot be detected early

Answer

It often begins in the bronchi

Answer

It has no relation to smoking

Question 46

46. Which structure warms, moistens, and filters the air we breathe?

Question 47

47. What happens when alveolar walls break down?

Answer

Reduced surface area for gas exchange

Answer

Faster breathing

Answer

Improved oxygen absorption

Answer

Better lung capacity

Question 48

48. How does chronic smoking increase the risk of infections?

Answer

It raises oxygen levels

Answer

It improves immunity

Answer

It impairs immune cells and damages mucosal barriers

Answer

It increases cilia movement

Question 49

49. Which of the following helps protect the lungs from harmful substances in the air?

Answer

Stomach acid

Answer

Cilia and mucus in the airways

Answer

Kidney function

Question 50

50. What is the role of mucus in the respiratory tract?

Answer

Breaks down food

Answer

Traps dust and microbes

Answer

Increases oxygen

Answer

Lubricates the lungs

Question 51

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Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Biology Respiration Online Mcqs Test

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Important Biology Respiration Question and Answer

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