Digestive & Respiratory System MCQ Quiz – Part 4
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This Digestive & Respiratory System MCQ Quiz helps aspirants revise important concepts related to the structure and functions of the human digestive and respiratory systems, which are frequently asked in competitive exams. Regular practice of these MCQs improves conceptual understanding and helps candidates answer biology questions quickly and accurately.
GK Series – Biology – Digestive & Respiratory System MCQ Quiz |
|
| Subject | Biology |
| Chapter | Digestive & Respiratory System |
| Part | 4 |
| Questions | 25 |
Who Should Attempt This Digestive & Respiratory System MCQ Quiz?
This Digestive & Respiratory System MCQ Quiz is useful for aspirants preparing for SSC, Railways, Banking, Defence, and other government job exams, where basic biology questions are commonly asked in the General Knowledge section.
Topics Covered in This Digestive & Respiratory System MCQ Quiz
This quiz includes MCQs based on important topics such as organs of the digestive system, digestion and absorption of food, structure and functions of the respiratory system, breathing mechanism, and gas exchange, along with other fundamental concepts related to human digestion and respiration.
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Question 1 of 25
1. Question
Bronchioles end in tiny air sacs called
Correct
➤ Alveoli are tiny balloon-like air sacs at the ends of bronchioles.
➤ They are the main sites of gas exchange.Incorrect
➤ Alveoli are tiny balloon-like air sacs at the ends of bronchioles.
➤ They are the main sites of gas exchange. -
Question 2 of 25
2. Question
Gas exchange in the lungs occurs in the
Correct
➤ Alveoli are the primary sites of gas exchange in the lungs.
➤ Oxygen enters blood and carbon dioxide leaves the blood here.Incorrect
➤ Alveoli are the primary sites of gas exchange in the lungs.
➤ Oxygen enters blood and carbon dioxide leaves the blood here. -
Question 3 of 25
3. Question
Alveoli are surrounded by
Correct
➤ Alveoli are surrounded by a network of capillaries.
➤ These blood vessels allow efficient exchange of gases.Incorrect
➤ Alveoli are surrounded by a network of capillaries.
➤ These blood vessels allow efficient exchange of gases. -
Question 4 of 25
4. Question
Oxygen diffuses from the alveoli into the
Correct
➤ Oxygen from inhaled air diffuses into the blood through alveoli.
➤ Blood then transports oxygen to body cells.Incorrect
➤ Oxygen from inhaled air diffuses into the blood through alveoli.
➤ Blood then transports oxygen to body cells. -
Question 5 of 25
5. Question
Carbon dioxide from the blood diffuses into the
Correct
➤ Carbon dioxide moves from blood into alveoli.
➤ It is then exhaled out of the lungs.Incorrect
➤ Carbon dioxide moves from blood into alveoli.
➤ It is then exhaled out of the lungs. -
Question 6 of 25
6. Question
The diaphragm is a
Correct
➤ Diaphragm is a dome-shaped muscular structure.
➤ It forms the floor of the chest cavity and helps in breathing.Incorrect
➤ Diaphragm is a dome-shaped muscular structure.
➤ It forms the floor of the chest cavity and helps in breathing. -
Question 7 of 25
7. Question
The diaphragm mainly helps in
Correct
➤ The diaphragm plays a major role in the breathing process.
➤ Its movement changes lung volume during inhalation and exhalation.Incorrect
➤ The diaphragm plays a major role in the breathing process.
➤ Its movement changes lung volume during inhalation and exhalation. -
Question 8 of 25
8. Question
During inhalation, the diaphragm
Correct
➤ During inhalation, the diaphragm contracts and moves downward.
➤ This increases the volume of the chest cavity.Incorrect
➤ During inhalation, the diaphragm contracts and moves downward.
➤ This increases the volume of the chest cavity. -
Question 9 of 25
9. Question
During inhalation, the lungs
Correct
➤ During inhalation, lungs expand as air enters them.
➤ This occurs due to increased chest cavity volume.Incorrect
➤ During inhalation, lungs expand as air enters them.
➤ This occurs due to increased chest cavity volume. -
Question 10 of 25
10. Question
During exhalation, the diaphragm
Correct
➤ During exhalation, the diaphragm relaxes and moves upward.
➤ This reduces chest cavity volume.Incorrect
➤ During exhalation, the diaphragm relaxes and moves upward.
➤ This reduces chest cavity volume. -
Question 11 of 25
11. Question
During exhalation, the lungs
Correct
➤ During exhalation, lungs contract as air leaves them.
➤ This helps remove carbon dioxide from the body.Incorrect
➤ During exhalation, lungs contract as air leaves them.
➤ This helps remove carbon dioxide from the body. -
Question 12 of 25
12. Question
The respiratory center controlling breathing is located in the
Correct
➤ The respiratory center is located in the medulla oblongata.
➤ It controls the rhythm of breathing.Incorrect
➤ The respiratory center is located in the medulla oblongata.
➤ It controls the rhythm of breathing. -
Question 13 of 25
13. Question
The percentage of oxygen in inhaled air is approximately
Correct
➤ Inhaled air contains about 21% oxygen.
➤ Oxygen is required for cellular respiration.Incorrect
➤ Inhaled air contains about 21% oxygen.
➤ Oxygen is required for cellular respiration. -
Question 14 of 25
14. Question
The percentage of carbon dioxide in inhaled air is approximately
Correct
➤ Inhaled air contains about 0.04% carbon dioxide.
➤ This level increases after respiration.Incorrect
➤ Inhaled air contains about 0.04% carbon dioxide.
➤ This level increases after respiration. -
Question 15 of 25
15. Question
The percentage of carbon dioxide in exhaled air is approximately
Correct
➤ Exhaled air contains about 4.4% carbon dioxide.
➤ This CO₂ is produced during cellular respiration.Incorrect
➤ Exhaled air contains about 4.4% carbon dioxide.
➤ This CO₂ is produced during cellular respiration. -
Question 16 of 25
16. Question
Respiration that requires oxygen is called
Correct
➤ Aerobic respiration requires oxygen for energy production.
➤ It produces carbon dioxide, water and a large amount of energy (ATP).Incorrect
➤ Aerobic respiration requires oxygen for energy production.
➤ It produces carbon dioxide, water and a large amount of energy (ATP). -
Question 17 of 25
17. Question
Respiration that occurs without oxygen is called
Correct
➤ Anaerobic respiration occurs in the absence of oxygen.
➤ It releases less energy compared to aerobic respiration.Incorrect
➤ Anaerobic respiration occurs in the absence of oxygen.
➤ It releases less energy compared to aerobic respiration. -
Question 18 of 25
18. Question
The main end products of aerobic respiration are
Correct
➤ Aerobic respiration produces carbon dioxide, water and energy.
➤ Energy is stored in the form of ATP molecules.Incorrect
➤ Aerobic respiration produces carbon dioxide, water and energy.
➤ Energy is stored in the form of ATP molecules. -
Question 19 of 25
19. Question
The number of ATP molecules produced during aerobic respiration is approximately
Correct
➤ Aerobic respiration produces about 38 ATP molecules per glucose.
➤ This provides large amounts of energy to cells.Incorrect
➤ Aerobic respiration produces about 38 ATP molecules per glucose.
➤ This provides large amounts of energy to cells. -
Question 20 of 25
20. Question
Anaerobic respiration produces approximately
Correct
➤ Anaerobic respiration produces only about 2 ATP molecules.
➤ This is much less energy than aerobic respiration.Incorrect
➤ Anaerobic respiration produces only about 2 ATP molecules.
➤ This is much less energy than aerobic respiration. -
Question 21 of 25
21. Question
In humans, anaerobic respiration in muscles produces
Correct
➤ Anaerobic respiration in muscles produces lactic acid.
➤ Accumulation of lactic acid causes muscle cramps.Incorrect
➤ Anaerobic respiration in muscles produces lactic acid.
➤ Accumulation of lactic acid causes muscle cramps. -
Question 22 of 25
22. Question
In yeast, anaerobic respiration produces
Correct
➤ Yeast performs anaerobic respiration producing ethanol and CO₂.
➤ This process is used in bread and alcohol production.Incorrect
➤ Yeast performs anaerobic respiration producing ethanol and CO₂.
➤ This process is used in bread and alcohol production. -
Question 23 of 25
23. Question
The first step of cellular respiration is called
Correct
➤ Glycolysis is the first stage of cellular respiration.
➤ It occurs in the cytoplasm of the cell.Incorrect
➤ Glycolysis is the first stage of cellular respiration.
➤ It occurs in the cytoplasm of the cell. -
Question 24 of 25
24. Question
Glycolysis breaks down glucose into
Correct
➤ Glycolysis converts one glucose molecule into two pyruvate molecules.
➤ A small amount of ATP and NADH is produced.Incorrect
➤ Glycolysis converts one glucose molecule into two pyruvate molecules.
➤ A small amount of ATP and NADH is produced. -
Question 25 of 25
25. Question
Glycolysis occurs in the
Correct
➤ Glycolysis occurs in the cytoplasm of the cell.
➤ It is the first stage of cellular respiration.Incorrect
➤ Glycolysis occurs in the cytoplasm of the cell.
➤ It is the first stage of cellular respiration.