Biology Respiration Online Mcqs Test

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Question 1

1. Which structure prevents food from entering the trachea?

Answer

Epiglottis

Question 2

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

Answer

Weakened diaphragm

Answer

Less physical activity

Answer

Damaged alveoli and reduced surface area

Answer

High carbon dioxide levels in blood

Question 3

3. Which muscle is primarily responsible for breathing?

Answer

Intercostal muscle

Answer

Pectoral muscle

Answer

Abdominal muscle

Question 4

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

Answer

High nitrogen levels

Answer

Low oxygen levels in muscles

Answer

Rising carbon dioxide levels in blood

Answer

Low heart rate

Question 5

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

Answer

Carbon dioxide

Question 6

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

Answer

Low immunity

Answer

Damaged cilia and excess mucus

Answer

Lung expansion

Question 7

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

Answer

Lubricates the lungs

Answer

Traps dust and microbes

Answer

Breaks down food

Answer

Increases oxygen

Question 8

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

Answer

Nasal cavity

Question 9

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

Answer

Carbon dioxide

Question 10

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

Answer

Bronchioles

Question 11

11. What is tidal volume?

Answer

Air exchanged in a normal breath

Answer

Maximum air that can be exhaled

Answer

Volume of oxygen in blood

Answer

Air remaining after exhalation

Question 12

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

Answer

Nasal cavity

Question 13

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

Answer

Increases their activity

Answer

Paralyzes or destroys them

Answer

Has no effect

Answer

Strengthens their movement

Question 14

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

Question 15

15. What is the function of intercostal muscles?

Answer

Filter air

Answer

Produce mucus

Answer

Help in heart contractions

Answer

Move ribs during breathing

Question 16

16. Which part of the brain controls breathing?

Answer

Cerebellum

Answer

Medulla oblongata

Answer

Hypothalamus

Question 17

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

Answer

Lung cancer

Question 18

18. What structure branches into bronchi?

Question 19

19. 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 20

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

Answer

Mouth → Bronchi → Larynx → Trachea → Alveoli

Answer

Nose → Larynx → Trachea → Bronchi → Alveoli

Answer

Nose → Trachea → Larynx → Bronchi → Alveoli

Answer

Nose → Bronchi → Trachea → Alveoli

Question 21

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

Answer

It cannot be detected early

Answer

It often begins in the bronchi

Answer

It is caused by bacteria

Answer

It has no relation to smoking

Question 22

22. What is the role of hemoglobin in respiration?

Answer

Transports oxygen in the blood

Answer

Filters oxygen

Answer

Traps bacteria

Answer

Produces enzymes

Question 23

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

Answer

Bronchitis

Question 24

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

Answer

Destroys red blood cells

Answer

Dissolves in plasma

Answer

Enhances oxygen binding

Answer

Binds with hemoglobin, reducing oxygen transport

Question 25

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

Question 26

26. Which of the following best describes exhalation?

Answer

Sudden air intake

Answer

Active contraction of diaphragm

Answer

Absorption of oxygen

Answer

Passive process involving muscle relaxation

Question 27

27. What is the medical term for breathing?

Answer

Ventilation

Answer

Respiration

Answer

Inhalation

Answer

Circulation

Question 28

28. 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 29

29. How does smoking affect lung alveoli?

Answer

Strengthens their walls

Answer

Cleans them

Answer

Destroys them over time

Answer

Increases their number

Question 30

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

Answer

Excretory system

Answer

Digestive system

Answer

Circulatory system

Answer

Nervous system

Question 31

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

Answer

Improved ventilation and alveolar efficiency

Answer

Stronger heart

Answer

Frequent use of inhalers

Answer

Higher red blood cell count

Question 32

32. During inhalation, what happens to the diaphragm?

Answer

Contracts and moves downward

Answer

Relaxes and moves upward

Answer

Contracts and moves upward

Answer

Expands sideways

Question 33

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

Answer

Stomach acid

Answer

Kidney function

Answer

Cilia and mucus in the airways

Question 34

34. What is the main function of the trachea?

Answer

Filter and moisten air

Answer

Trap carbon dioxide

Answer

Site of gas exchange

Answer

Transport air to bronchi

Question 35

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

Answer

Nasal cavity

Question 36

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

Answer

Cellular respiration

Answer

Photosynthesis

Question 37

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

Question 38

38. What surrounds the alveoli to facilitate gas exchange?

Answer

Capillaries

Answer

Bronchioles

Question 39

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

Answer

Increases above atmospheric pressure

Answer

Matches atmospheric pressure

Answer

Decreases below atmospheric pressure

Answer

Stays constant

Question 40

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

Answer

Chronic cough

Answer

High blood sugar

Answer

Joint pain

Question 41

41. What happens to the chest cavity during exhalation?

Answer

Expands more

Answer

Becomes larger

Answer

Contracts and volume decreases

Answer

Remains unchanged

Question 42

42. Which organ is directly responsible for breathing?

Question 43

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

Answer

Tuberculosis

Answer

Lung cancer

Question 44

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

Answer

Produce energy

Answer

Exchange gases

Answer

Regulate temperature

Answer

Filter blood

Question 45

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

Answer

Respiration

Answer

Exhalation

Answer

Ventilation

Answer

Inhalation

Question 46

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

Answer

It raises oxygen levels

Answer

It increases cilia movement

Answer

It improves immunity

Answer

It impairs immune cells and damages mucosal barriers

Question 47

47. Which process moves oxygen from lungs to blood?

Answer

Filtration

Answer

Active transport

Question 48

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

Answer

Residual volume

Answer

Tidal volume

Answer

Inspiratory reserve volume

Answer

Vital capacity

Question 49

49. What is the function of the bronchioles?

Answer

Filter blood

Answer

Transport air to alveoli

Answer

Exchange gases

Answer

Produce mucus

Question 50

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

Answer

Water vapor

Answer

Carbon monoxide

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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