Digestive & Respiratory System MCQ Quiz – Part 3
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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 |
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| Subject | Biology |
| Chapter | Digestive & Respiratory System |
| Part | 3 |
| 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
The first entry point of air into the human respiratory system is the
Correct
➤ The nose is the first entry point of air in the respiratory system.
➤ It allows air to enter the nasal cavity for filtration and warming.Incorrect
➤ The nose is the first entry point of air in the respiratory system.
➤ It allows air to enter the nasal cavity for filtration and warming. -
Question 2 of 25
2. Question
The main function of hair inside the nose is to
Correct
➤ Hair inside the nose filters the air.
➤ It traps dust particles and other impurities.Incorrect
➤ Hair inside the nose filters the air.
➤ It traps dust particles and other impurities. -
Question 3 of 25
3. Question
The mucus lining inside the nasal cavity mainly helps to
Correct
➤ Mucus traps dust particles and microbes present in air.
➤ It also moistens and warms the incoming air.Incorrect
➤ Mucus traps dust particles and microbes present in air.
➤ It also moistens and warms the incoming air. -
Question 4 of 25
4. Question
The pharynx acts as a common passage for
Correct
➤ Pharynx serves as a common passage for both air and food.
➤ It connects the nasal cavity to the larynx.Incorrect
➤ Pharynx serves as a common passage for both air and food.
➤ It connects the nasal cavity to the larynx. -
Question 5 of 25
5. Question
The structure known as the “voice box” is the
Correct
➤ Larynx is commonly called the voice box.
➤ It contains vocal cords responsible for sound production.Incorrect
➤ Larynx is commonly called the voice box.
➤ It contains vocal cords responsible for sound production. -
Question 6 of 25
6. Question
The larynx contains structures called
Correct
➤ Vocal cords are present inside the larynx.
➤ Air passing through them produces sound.Incorrect
➤ Vocal cords are present inside the larynx.
➤ Air passing through them produces sound. -
Question 7 of 25
7. Question
The visible protrusion in the throat associated with the larynx is called
Correct
➤ Adam’s apple is the visible part of the larynx in the neck.
➤ It is usually more prominent in males.Incorrect
➤ Adam’s apple is the visible part of the larynx in the neck.
➤ It is usually more prominent in males. -
Question 8 of 25
8. Question
The larynx is located at the
Correct
➤ The larynx lies at the upper end of the trachea.
➤ It connects the pharynx to the trachea.Incorrect
➤ The larynx lies at the upper end of the trachea.
➤ It connects the pharynx to the trachea. -
Question 9 of 25
9. Question
The main function of the larynx is
Correct
➤ The larynx produces sound using vocal cords.
➤ It is therefore called the voice box.Incorrect
➤ The larynx produces sound using vocal cords.
➤ It is therefore called the voice box. -
Question 10 of 25
10. Question
Which structure prevents food from entering the windpipe during swallowing?
Correct
➤ Epiglottis is a flap-like structure.
➤ It closes the trachea during swallowing to prevent food entering the lungs.Incorrect
➤ Epiglottis is a flap-like structure.
➤ It closes the trachea during swallowing to prevent food entering the lungs. -
Question 11 of 25
11. Question
The trachea is commonly known as the
Correct
➤ Trachea is commonly called the windpipe.
➤ It carries air from the larynx to the bronchi.Incorrect
➤ Trachea is commonly called the windpipe.
➤ It carries air from the larynx to the bronchi. -
Question 12 of 25
12. Question
The trachea is supported by rings of
Correct
➤ The trachea contains C-shaped cartilage rings.
➤ These rings prevent the trachea from collapsing during breathing.Incorrect
➤ The trachea contains C-shaped cartilage rings.
➤ These rings prevent the trachea from collapsing during breathing. -
Question 13 of 25
13. Question
The trachea divides into two tubes called
Correct
➤ The trachea divides into two bronchi.
➤ Each bronchus enters one lung.Incorrect
➤ The trachea divides into two bronchi.
➤ Each bronchus enters one lung. -
Question 14 of 25
14. Question
Each bronchus carries air into the
Correct
➤ Bronchi transport air from the trachea into the lungs.
➤ They further divide into smaller tubes called bronchioles.Incorrect
➤ Bronchi transport air from the trachea into the lungs.
➤ They further divide into smaller tubes called bronchioles. -
Question 15 of 25
15. Question
The smaller branches of bronchi inside the lungs are called
Correct
➤ Bronchioles are smaller branches of bronchi inside the lungs.
➤ They distribute air throughout the lungs.Incorrect
➤ Bronchioles are smaller branches of bronchi inside the lungs.
➤ They distribute air throughout the lungs. -
Question 16 of 25
16. Question
Tiny openings present on the surface of leaves for gas exchange are called
Correct
➤ Stomata are microscopic pores present on the surface of leaves.
➤ They allow exchange of oxygen, carbon dioxide and water vapor.Incorrect
➤ Stomata are microscopic pores present on the surface of leaves.
➤ They allow exchange of oxygen, carbon dioxide and water vapor. -
Question 17 of 25
17. Question
Each stoma is surrounded by two specialized cells called
Correct
➤ Guard cells surround each stomatal opening.
➤ They control the opening and closing of stomata.Incorrect
➤ Guard cells surround each stomatal opening.
➤ They control the opening and closing of stomata. -
Question 18 of 25
18. Question
Guard cells regulate
Correct
➤ Guard cells regulate the opening of stomata.
➤ This controls gas exchange and transpiration in plants.Incorrect
➤ Guard cells regulate the opening of stomata.
➤ This controls gas exchange and transpiration in plants. -
Question 19 of 25
19. Question
The process of loss of water vapor from plant leaves is called
Correct
➤ Transpiration is the loss of water vapor from plant surfaces.
➤ It mainly occurs through stomata in leaves.Incorrect
➤ Transpiration is the loss of water vapor from plant surfaces.
➤ It mainly occurs through stomata in leaves. -
Question 20 of 25
20. Question
Gas exchange in leaves mainly occurs through
Correct
➤ Stomata allow exchange of gases between the plant and atmosphere.
➤ Oxygen enters and carbon dioxide exits through these pores.Incorrect
➤ Stomata allow exchange of gases between the plant and atmosphere.
➤ Oxygen enters and carbon dioxide exits through these pores. -
Question 21 of 25
21. Question
Mature plant stems are usually covered with an impermeable layer called
Correct
➤ The epidermis forms the outer protective layer of stems.
➤ It helps prevent excess water loss.Incorrect
➤ The epidermis forms the outer protective layer of stems.
➤ It helps prevent excess water loss. -
Question 22 of 25
22. Question
Which process results in loss of water droplets from leaf edges at night?
Correct
➤ Guttation is the loss of liquid water droplets from leaf edges.
➤ It usually occurs during night when transpiration is low.Incorrect
➤ Guttation is the loss of liquid water droplets from leaf edges.
➤ It usually occurs during night when transpiration is low. -
Question 23 of 25
23. Question
Guttation occurs through special structures called
Correct
➤ Hydathodes are special structures present at leaf edges.
➤ They release water droplets during guttation.Incorrect
➤ Hydathodes are special structures present at leaf edges.
➤ They release water droplets during guttation. -
Question 24 of 25
24. Question
Water loss during guttation is mainly in the form of
Correct
➤ In guttation, water is released as liquid droplets.
➤ This is different from transpiration which releases water vapor.Incorrect
➤ In guttation, water is released as liquid droplets.
➤ This is different from transpiration which releases water vapor. -
Question 25 of 25
25. Question
The main function of stomata is to regulate
Correct
➤ Stomata regulate gas exchange in plants.
➤ They also control transpiration and water balance.Incorrect
➤ Stomata regulate gas exchange in plants.
➤ They also control transpiration and water balance.