Biology Respiration Online Mcqs Test

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Question 1

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

Answer

Traps dust and microbes

Answer

Lubricates the lungs

Answer

Increases oxygen

Answer

Breaks down food

Question 2

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

Answer

Damaged cilia and excess mucus

Answer

Low immunity

Answer

Lung expansion

Question 3

3. What is the main function of the trachea?

Answer

Site of gas exchange

Answer

Filter and moisten air

Answer

Trap carbon dioxide

Answer

Transport air to bronchi

Question 4

4. How does smoking affect lung alveoli?

Answer

Strengthens their walls

Answer

Destroys them over time

Answer

Increases their number

Answer

Cleans them

Question 5

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

Answer

Nose → Trachea → Larynx → Bronchi → Alveoli

Answer

Nose → Bronchi → Trachea → Alveoli

Answer

Nose → Larynx → Trachea → Bronchi → Alveoli

Answer

Mouth → Bronchi → Larynx → Trachea → Alveoli

Question 6

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

Answer

Bronchioles

Question 7

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

Answer

Low oxygen levels in muscles

Answer

High nitrogen levels

Answer

Rising carbon dioxide levels in blood

Answer

Low heart rate

Question 8

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

Answer

Tidal volume

Answer

Residual volume

Answer

Vital capacity

Answer

Inspiratory reserve volume

Question 9

9. What is the medical term for breathing?

Answer

Circulation

Answer

Inhalation

Answer

Ventilation

Answer

Respiration

Question 10

10. 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 11

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

Answer

Carbon dioxide

Question 12

12. What is the function of the bronchioles?

Answer

Exchange gases

Answer

Filter blood

Answer

Transport air to alveoli

Answer

Produce mucus

Question 13

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

Question 14

14. 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

Stronger heart

Answer

Improved ventilation and alveolar efficiency

Question 15

15. What surrounds the alveoli to facilitate gas exchange?

Answer

Bronchioles

Answer

Capillaries

Question 16

16. What structure branches into bronchi?

Question 17

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

Answer

Lung cancer

Question 18

18. What happens when alveolar walls break down?

Answer

Better lung capacity

Answer

Reduced surface area for gas exchange

Answer

Improved oxygen absorption

Answer

Faster breathing

Question 19

19. What happens to the chest cavity during exhalation?

Answer

Expands more

Answer

Remains unchanged

Answer

Contracts and volume decreases

Answer

Becomes larger

Question 20

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

Answer

Excretory system

Answer

Circulatory system

Answer

Digestive system

Answer

Nervous system

Question 21

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

Answer

Less physical activity

Answer

Weakened diaphragm

Answer

High carbon dioxide levels in blood

Answer

Damaged alveoli and reduced surface area

Question 22

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

Question 23

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

Answer

Ventilation

Answer

Inhalation

Answer

Respiration

Answer

Exhalation

Question 24

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

Question 25

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

Answer

Carbon dioxide

Question 26

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

Answer

Photosynthesis

Answer

Cellular respiration

Question 27

27. Which muscle is primarily responsible for breathing?

Answer

Intercostal muscle

Answer

Abdominal muscle

Answer

Pectoral muscle

Question 28

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

Answer

Destroys red blood cells

Answer

Binds with hemoglobin, reducing oxygen transport

Answer

Enhances oxygen binding

Answer

Dissolves in plasma

Question 29

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

Answer

It has no relation to smoking

Answer

It often begins in the bronchi

Answer

It is caused by bacteria

Answer

It cannot be detected early

Question 30

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

Answer

Nasal cavity

Question 31

31. Which structure prevents food from entering the trachea?

Answer

Epiglottis

Question 32

32. Which part of the brain controls breathing?

Answer

Hypothalamus

Answer

Medulla oblongata

Answer

Cerebellum

Question 33

33. During inhalation, what happens to the diaphragm?

Answer

Contracts and moves downward

Answer

Relaxes and moves upward

Answer

Expands sideways

Answer

Contracts and moves upward

Question 34

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

Answer

Regulate temperature

Answer

Exchange gases

Answer

Produce energy

Answer

Filter blood

Question 35

35. 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 36

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

Answer

Bronchitis

Question 37

37. Which organ is directly responsible for breathing?

Question 38

38. What is the function of intercostal muscles?

Answer

Move ribs during breathing

Answer

Produce mucus

Answer

Filter air

Answer

Help in heart contractions

Question 39

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

Answer

Nasal cavity

Question 40

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

Answer

High blood sugar

Answer

Joint pain

Answer

Chronic cough

Question 41

41. Which process moves oxygen from lungs to blood?

Answer

Active transport

Answer

Filtration

Question 42

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

Answer

Increases above atmospheric pressure

Answer

Stays constant

Answer

Decreases below atmospheric pressure

Answer

Matches atmospheric pressure

Question 43

43. What is tidal volume?

Answer

Volume of oxygen in blood

Answer

Air remaining after exhalation

Answer

Maximum air that can be exhaled

Answer

Air exchanged in a normal breath

Question 44

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

Answer

Has no effect

Answer

Increases their activity

Answer

Paralyzes or destroys them

Answer

Strengthens their movement

Question 45

45. How does smoking contribute to chronic bronchitis?

Answer

Increases lung elasticity

Answer

Reduces blood flow

Answer

Irritates bronchi and causes long-term inflammation

Answer

Strengthens immune system

Question 46

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

Answer

Tuberculosis

Answer

Lung cancer

Question 47

47. What is the role of hemoglobin in respiration?

Answer

Transports oxygen in the blood

Answer

Traps bacteria

Answer

Produces enzymes

Answer

Filters oxygen

Question 48

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

Answer

Nasal cavity

Question 49

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

Answer

Carbon monoxide

Answer

Water vapor

Question 50

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

Answer

It raises oxygen levels

Answer

It improves immunity

Answer

It increases cilia movement

Answer

It impairs immune cells and damages mucosal barriers

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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