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Biology Respiration Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Biology Respiration Question and Answer

Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Biology Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Biology Interview Question Answer Universities Entrance Test

Biology Respiration Practice Test Online With Explanation

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1. What happens when alveolar walls break down?

Better lung capacity

Reduced surface area for gas exchange

Improved oxygen absorption

Faster breathing

2. What is the function of intercostal muscles?

Produce mucus

Help in heart contractions

Move ribs during breathing

Filter air

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

Carbon dioxide

Oxygen

Nitrogen

Methane

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

Skin rash

Chronic cough

High blood sugar

Joint pain

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

Pharynx

Bronchi

Trachea

Larynx

6. What is the main function of the trachea?

Filter and moisten air

Site of gas exchange

Transport air to bronchi

Trap carbon dioxide

7. What is the function of the bronchioles?

Transport air to alveoli

Filter blood

Exchange gases

Produce mucus

8. How does smoking contribute to chronic bronchitis?

Increases lung elasticity

Strengthens immune system

Irritates bronchi and causes long-term inflammation

Reduces blood flow

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

Matches atmospheric pressure

Decreases below atmospheric pressure

Stays constant

Increases above atmospheric pressure

10. Which part of the brain controls breathing?

Cerebrum

Hypothalamus

Cerebellum

Medulla oblongata

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

Trachea

Nasal cavity

Pharynx

Larynx

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

Pneumonia

Bronchitis

Asthma

Emphysema

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

Stomach acid

Bile

Kidney function

Cilia and mucus in the airways

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

Asthma

Arthritis

Diabetes

Lung cancer

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

Vital capacity

Residual volume

Tidal volume

Inspiratory reserve volume

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

Nose → Larynx → Trachea → Bronchi → Alveoli

Mouth → Bronchi → Larynx → Trachea → Alveoli

Nose → Bronchi → Trachea → Alveoli

Nose → Trachea → Larynx → Bronchi → Alveoli

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

Alveoli

Trachea

Bronchi

Pleura

18. What is the role of hemoglobin in respiration?

Filters oxygen

Traps bacteria

Produces enzymes

Transports oxygen in the blood

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

It cannot be detected early

It often begins in the bronchi

It is caused by bacteria

It has no relation to smoking

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

Rising carbon dioxide levels in blood

High nitrogen levels

Low heart rate

Low oxygen levels in muscles

21. Which of the following best describes exhalation?

Active contraction of diaphragm

Sudden air intake

Passive process involving muscle relaxation

Absorption of oxygen

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

Pharynx

Bronchus

Trachea

Nasal cavity

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

Cellular respiration

Photosynthesis

Digestion

Excretion

24. What structure branches into bronchi?

Larynx

Trachea

Pharynx

Nose

25. Which process moves oxygen from lungs to blood?

Active transport

Filtration

Osmosis

Diffusion

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

Nicotine

Water vapor

Oxygen

Carbon monoxide

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

Alveoli

Bronchi

Bronchioles

Trachea

28. How does smoking affect lung alveoli?

Increases their number

Strengthens their walls

Cleans them

Destroys them over time

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

Tuberculosis

Typhoid

Lung cancer

Hepatitis

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

Lubricates the lungs

Traps dust and microbes

Increases oxygen

Breaks down food

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

Paralyzes or destroys them

Has no effect

Strengthens their movement

Increases their activity

32. What surrounds the alveoli to facilitate gas exchange?

Bronchioles

Arteries

Capillaries

Veins

33. Which organ is directly responsible for breathing?

Liver

Lungs

Heart

Kidney

34. Which structure prevents food from entering the trachea?

Epiglottis

Alveolus

Larynx

Pharynx

35. What is the medical term for breathing?

Ventilation

Circulation

Inhalation

Respiration

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

Improved ventilation and alveolar efficiency

Higher red blood cell count

Stronger heart

Frequent use of inhalers

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

Nose

Larynx

Trachea

Bronchi

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

It impairs immune cells and damages mucosal barriers

It improves immunity

It raises oxygen levels

It increases cilia movement

39. Which muscle is primarily responsible for breathing?

Abdominal muscle

Pectoral muscle

Intercostal muscle

Diaphragm

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

Excretory system

Digestive system

Circulatory system

Nervous system

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

Damaged alveoli and reduced surface area

Less physical activity

High carbon dioxide levels in blood

Weakened diaphragm

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

Ventilation

Exhalation

Inhalation

Respiration

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

Carbon dioxide

Hydrogen

Nitrogen

Oxygen

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

Produce energy

Exchange gases

Filter blood

Regulate temperature

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

Damaged cilia and excess mucus

Lung expansion

Infection

Low immunity

46. During inhalation, what happens to the diaphragm?

Expands sideways

Relaxes and moves upward

Contracts and moves upward

Contracts and moves downward

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

Alveoli

Pharynx

Nasal cavity

Trachea

48. What is tidal volume?

Volume of oxygen in blood

Maximum air that can be exhaled

Air remaining after exhalation

Air exchanged in a normal breath

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

Destroys red blood cells

Enhances oxygen binding

Dissolves in plasma

Binds with hemoglobin, reducing oxygen transport

50. What happens to the chest cavity during exhalation?

Contracts and volume decreases

Remains unchanged

Expands more

Becomes larger

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Mustansar KhanLast Updated: October 14, 2025

Biology Respiration Online Mcqs Test

Important Biology Respiration Question and Answer

Biology Respiration Practice Test Online With Explanation

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